she just told me that she is with someone elseHELP

[Michael Mc C]

Well I really trust and honor the opinion of my in-law, especially my mother in-law. They both are very intelligent, caring and successful individuals. They have taught me so much from the time that I have known them.

If you are close enough to them, why not? You trust them, you've known them for quite some time I imagine and they are both successful. Maybe it would be awkward due to your situation but if nothing else you can tell them what you're attempting to do and they may be able to provide some guidance.

Just remember what it is you're trying to do. Are you trying to get their daughter to change her mind or are you working to make MWEL a more confident and self-sufficient individual? The first option may be the desire but it is the second that is an absolute necessity.

The first cannot happen without the second IMO. It may still never happen regardless of how successful you are with your efforts. In order for any relationship (this one or a new one) to be prosperous, you have to do what is needed.