1-get her psychological testing report from a trained clinical psychologist
2-WHAT MEDICINE SHE IS ON??
3-OCD is not big illness you will not get divorce
4-You are reactions are normal of any human being who suddenly discovers mental illness in spouse
5-Psychiatric patient become child like thats why they cannot take responsibility.You will have to get educated about her illness from internet and educate her parents.
6-Ask for help from her parents and explain them signs and affects of illness in your life.
7-Reduce your expectations from her.
8-Give yourself two years to get her treated by good psychiatrist
9-Check if her thyroid hormone is normal
10-Do your bit which is in your hand not expecting anything in return.
11-Dont play blame game with your inlaws
12- Avoid those relatives (not parents) who dont understand your problem
14-Look after your health ,finanaces and take good sleep
15-Surrender to will of god and do your duty as much as you have done.