First. Stop blaming her family. She has been with you FAR too long for that excuse to be believed. This is HER doing. I am sure her family is supporting her, but she is making this decision on her own.
Next.. What is this "abuse" all about. I don't know you from Adam, so just because you say there wasn't any, doesn't mean it isn't true. Many abusers deny their abuse. Are you in denial? Why would she leave you and use abuse as the issue if you were so good to her for so long? Don't you see that wouldn't make sense?
Next... My best estimation is that there IS another man in the picture if there hasn't been abuse.
Women don't just up and leave if you haven't abused them and and/or if there isn't another man. The percentages of women who are doing what your wife is doing is VERY VERY high that there is another man in her thoughts. Most men deny and just won't believe their wife would or could do such a thing. I would say this is a very distinct possibility. She is showing all the classic signs.
That is my take. It is hard to help someone reconcile if we don't know the facts. It then becomes nothing more than a guessing game or a trial by error method....
First we need to figure out the truth and sort out the facts...
Any abuse? any at ALL? NONE? SOME? Any SHE would consider abuse that you don't??.. None? Verbal? Never "accidently" pushed her? when drinking?....
if no abuse whatsoever then why would she leave? Her dad????? (I highly doubt it)
Another man???? (high possibility based on the thousands of these I have read and observed over the years)