If you have to know if there is OM, you can ask. The likelihood of her being completely honest with answering that question is NOT very high IMO. For some people, this is unforgivable and there is no turning back. Perhaps this is you. This is something only you can answer.
As for the email....you have good intentions, but I think it is too soft. What do you plan on doing if/when she says to buzz off? No matter what you do, she's going to be upset. She is going to be reluctant to divert from her desired path. I think you have to send a strong message that demonstrates that you mean business.
So find out what your rights are and ensure that you protect them.
Don't allow fear to be your guide. Fear will guide you directly to regret.
Me:45 ExW:48 M:04/97 3 Bombs & 2 ReCons 1st BD 11/10 D Finalized 4/20 D-16 S-14 Going in one more round when you don't think you can. That's what makes all the difference in life.~Rocky Balboa