No experience regarding work, but the thought crossed my mind of having a goodnight phonecall with her at bedtime. Would that help?
Dd2 has terrible separation anxiety from me at night when she wakes and I'm out. Makes having a night off difficult :/ so I understand that side of it.
I hope she finds a new groove soon and realises daddy is -almost- as good as mummy and that mummy always comes home after a while.