I doubt I'll see her before this summer. They live 2,000 miles away from me. I will be seeing him in April at a poly social event, which she likely will not attend with him, even though he wants her to come and I've encouraged it as well. (Plus the wife has an email friendship with my husband, whom she has never met, and he will be there too.)
She and I do email occasionally, but I have to say that I haven't enjoyed that much. She and I are very different people, and even though I know she doesn't intend to see me as an adversary, that still comes through the communication a bit, for me.
Mainly, the feeling I get from her is "There is nothing in it for me personally, that my husband has these feelings from you and is sleeping with you. So I won't make too many waves, but I certainly won't like it either, and I'm not going to go out of my way to smooth the path for you two."