It is very clear that Prats has chosen her principles over her marraige. So now its time to act on it.
First step- get out of the house with Kesar whenever you get an oppurtunity.
Second step- Just contact Aman (he is a good resource) and get a safe place to stay (a shelter).
Third step- Talk to Kesar and file a FIR against the Thakur's about her beating and medical state (this time use Aman's and his dad's expertice).
Fourth step- Decide about your future with Krishna and follow through.
Remember You cannot fight your battles in the enemie's place. Protect yourself and Kesar first and then get them one by one.