I think you and your husband have a point. It's not something, I believe, that's appropriate to push. On the other hand, making a couple of positive comments about the choice not to circumcise isn't inappropriate AND if she decides to discuss the issue with you then I think you'd have every right to talk about your feelings and opinions on the matter. I belong to a chat board for adoptive parents of Korean kids, where most boys come home uncirced, and it's been great to see the number of parents who have decided NOT to circ after seeing discussions about it in the forum.
In the end, though, it's their choice. I've had friends that have chosen to circ, and while I don't really understand it...I still think the're fantastic parents and good friends. Sometimes I think people make circ/no circ too much of an issue, and that turns
potentially no-circ'ing people off. Tread lightly.