1. She – her side of family may advice her to file for interim maintenance under Civil laws.
2. She – her side of family may advice her to file divorce under parties Personal Laws.
3. She – her side of family may advice her to file S. 498A under Criminal Laws.
4. She – her side of family may advice her to file complaint under DV Act, 2005.
5. An Advocate is found via local reference and after certain due diligence a party hires him.
However, since you are approaching here on third party facts basis it is advised to try advising them to opt few sessions before a professional Marriage Counselor found via local reference? Who knows their marriage may get saved as third party facts when passed around lots of facts gets lost in translations, meaning the situation may afterall between them may not be that bad as projected and chances of saving their marriage may be possible.
Notes:
Your question on safeguard tip(s) to give to your cousin which you asked so abruptly amused me. Since you asked I will not disappoint you and here is only one tip that can be passed on to your cousin with a caveat (if he actually understood the quote then he will have smiles till divorce as per his terms in his hand as per his Personal Laws and if he could not understand then bad luck!)
"My residence address is New Delhi Railway Station, platform number 1"
