He just took to her naturally
It does sound like he has a special affinity with your daughter - it may take time but your terrier will calm down eventually. As you say, the routine is all over the place at the moment which must seem very strange not to mention all the new scents in the home.

Sounds easy to say, but do try not to let it stress you too much. You have to focus pretty much all your energy on the baby right now but the time will come when she has her naps and you will then have time to spend with your dogs. Don't try to be supermum to everyone - you will wear yourself out