She was introduced to Malayalam cinema by Director Hariharan. Her first movie was Mayookham.soon she became a very busy actress. Then she acted in Bus Conductor starring Mammootty and Lanka starring Suresh Gopi. Her each movie showed her different faces.
Mamta Mohandas is an Indian film actress and playback singer. Mamta was   born on 14 November 1985 in Kannur into a well off Malayali family  which  originally hails from Kannur. She attended the Indian School,  Bahrain  until 2002. She pursued a Bachelor's degree at Mount Carmel  College  Bangalore. She modeled for print ads for companies such as IBM  and  Kalyan Kendra and modeled on the ramp for the Mysore Maharajah and   Raymonds. Mamta is trained in Carnatic and Hindustani music.
Mamta Mohandas has had a whirlwind journey from 11.11.11, the day she   got engaged to Pregith Padmanabhan, he childhood friend and great   supporter to 12.12.12, when she announces her decision to divorce, which   could alter her life in more ways than one. 
Mamta has mainly acted in Malayalam films, besides few Telugu and Tamil   productions and one Kannada film. She has won two Filmfare Awards, for   Best Female Playback Singer in Telugu in 2006 and for Best Actress in   Malalayam in 2010.
Mamta buted in the 2005 Malayalam film Mayookham, directed by   Hariharan. Although the film did not do well at the box office, Mamta attracted attention for her sensitive portrayal of Indira.
Subsequently, she acted alongside Mammootty in Bus Conductor, with   Suresh Gopi in the films Adbutham (2006) and Lanka (2006), and alongside   Jayaram in Madhuchandralekha (2006). She also played the female lead in Baba Kalyani with Mohanlal. Later that year, she buted in the Tamil film industry, starring in the Karu Pazhaniappan-directed film   Sivappathigaram opposite Vishal Krishna, which turned out to be an average grosser.
In 2007 she acted with Mammootty in the blockbuster film Big B. She eventually stepped into the Telugu film industry as well, when she appeared in a supporting role in the film Yamadonga, directed by SS   Rajamouli. The film became one of the biggest hits of the year. She had lent her voice for a couple of songs in this film too. In 2008, she appeared in 7 films, predominantly in Telugu-language films. Her first release was her but Kannada film Gooli. 
She then starred in the film Krishnarjuna, essaying the lead female role, which did not do well at the box office. The victory was her next assignment as lead actress, but that film also failed at the box office,   following which she appeared in a cameo role in her only Tamil release that year, Kuselan, alongside Tamil superstar Rajinikanth. Three more   Telugu releases featured Mamta, including Homam, directed by JD   Chakravarthy and Srinu Vaitla's King opposite Nagarjuna.
In both these films, she also performed as a playback singer in several songs. In 2009, she starred in the comedy film Guru En Aalu alongside   Madhavan, and the thriller Passenger, sharing screen space with Dileep and Sreenivasan, respectively. While the former had an average run at the box office, the latter was declared a surprise sleeper hit in   Malayalam. The film 'Passenger' in which she played the role of a   television reporter 'Anuradha', became a turning point in Mamta's career. 
In 2010, she worked with Jayaram in the critically acclaimed Kadha   Thudarunnu directed by Sathyan Anthikkad, for which she won her first   Best Actress Award from Filmfare. This film also won her the 'Vanitha award for best actress - Malayalam', the 'Mathrubhumi award for best actress - Malayalam' and the 'Asianet award for the best actress-   Malayalam '. Other projects in 2010 included Musafir with Rahman, Anwar with Prithviraj, and Kedi with Nagarjuna. Mamta's first film in 2011   was the Malayalam film Race, in which she played the role of Niya, wife of a cardio surgeon Abey (Kunchacko Boban). The film failed to do well at the box office. Her next release in Malayalam was Naayika. Mamta has completed work on her third Tamil film, Thadaiyara Thaakka directed by   Magizh Thirumeni.
Mamta had her first song sung for the Telugu film Rakhi, singing the title song under Devi Sri Prasad's direction, making her but in the   Telugu film industry as a singer before making her acting but in    Telugu. She went on to win the 2006 Filmfare Best Female Playback Singer   Award for that song.
Subsequently, she was asked to sing several songs for composer Devi Sri   Prasad, including the chartbuster Akalesthe Annam Pedtha for the   Chiranjeevi-starrer Shankardada Zindabad (later dubbed as Daddy Mummy in   the Tamil film Villu), 36-24-36 for the film Jagadam, Mia for   Tulasi, and Ghanana (Funny) and the title song for the film King.   Other music directors she has worked with include M. M. Keeravani (for her own films Yamadonga and Krishnarjuna, also Chandamama), R. P.   Patnaik (for Andamaina Mansulo), Chakri (for Victory), Nithin Raikwar   (for her own film Homam) and Thaman (for Jayeebhava).
In Tamil, she sang Kaalai Kaalai in the film Kaalai, which starred   Silambarasan in the lead role. She sang Idai Vazhi for the comedy film   Goa under noted composer Yuvan Shankar Raja's direction. Both songs featured her singing alongside Benny Dayal. She was heard for the first time in her mother tongue, Malayalam, in the 2010 film Anwar. She has also recorded a song for her recent film Thriller. In the film   'Mohabath', she sang a duet with Hariharan. She sang Iravil Viriyum in her 2012 film Arike.
Mamta is really fortunate enough to win several awards in a shorter period. Her achievements count too:
Kerala State Film Award
Kerala Film Critics Awards
Filmfare Awards South
Asianet Film Awards
The Pearl Malayalam Film Awards

She has also been nominated for,

Filmfare Award for Best Actress - Malayalam - Passenger.
Filmfare Award for Best Actress - Malayalam - Arike.
Filmfare Award for Best Playback Singer(Female)-Malayalam-Iravil Viriyum from Arike.
2nd South Indian International Movie Award for Best Female Playback Singer-Malayalam-Iravil Viriyum from Arike.

Though she is facing her troubles and difficulties with a hard-core heart, let us all pray for her a minute for the speedy recovery and her fast return to Malayalam Film industry with serious and powerful roles.