Oh for sure, she'd be quite active in the community and volunteering. I don't think that part of her would change, even with children in the picture. That's just a part of her unselfish nature.
I understand what you're saying, but I think the fact that she is a very interested person ensures that she will involve herself in charitable and civic causes if she chooses not to work after the children come. Also, however unselfish her actions appear to us, she actually gets a lot out of being in the mix and being of use to others.