Are you planning to have any more children yourself? If so I am kind of the same opinion as your DH. Not that I want to put it that rudely but she kind of does need to get over it. I would try everything I could think of to make the adjustment easier but the fact is that most children have to learn to share mommy and its never easy. If you stop sitting for this little girl you will be teaching your little one that if she is that upset then you will just get rid of whatever is upsetting her. Unfortunately life doesn't work like that. Good luck.