One of the things that came through in your post is possibly a fear that the partner's mother is going to be so much in your daughter's life (or possibly I'm just projecting what I would feel). Please don't worry that she will replace you in any way in your daughter's affections - with the relationship you sound like you have, she can't possibly do that. Rejoice instead that your daughter does not have to struggle with a difficult "mother-in-law" relationship. That said, she will always need you to have her back as you understand her.
