Respected sir...
You have to give complaint to police Station for loading the FIR if there is influence or police denies to lodge FIR give a complaint to S.P of your district ...It is really sad that she is getting beaten up for this.
It pains me to see parents do this to their grown up daughter.
Please seek some legal help. I'm doubtful if it will be helpful as police or even some lawyers will dismiss you saying 'they are her parents'.
If possible ask her to stay at her relatives place. Preferably the ones who are a little more sensible.
I doubt if your parents will let you live her at your place.
Even if you live with your room mates and you ask her to live with you for a couple of weeks, both the options can backfire.
The girl's family can easily claim you kidnapped her or your family was involved or come up with any scenario just to get her back.
Last resort would be to ask her to move into a hostel for a couple of weeks.
If you are 25 and above and have a stable job, consider marriage.
If not, wait till things settle down for a while.
Do not leave a girl who just got beat up for you just go and take legal action against all the family members but you must have some proof or evidence on wich you have to file complaint....
Thanku