I think the reverting back to pet names thing is a sign of comfort with you. This is good as it shows that your DBing has reduced any stress she felt around you. However, it may or may not be an indication of how interested she may or may not be in you.
I know I have a few times called W "honey" or even a pet name. This is more related to the lack of stress between us and force of habit than any desire I have to be with her.
Just my $.02!
SD
Me 41 W 41 Kids: S9 S7 Married 16 years Bomb dropped 2/2/07 Still living together! current thread