I reckon if she's sleeping so little at nursery, can you get them to do 2 naps? Just for nursery. The idea there is that she is probably very overstimulated and overtired by nap time there and if she can have two naps, she may cope better. My DS certainly did. He was solidly on one nap at home long before one nap at daycare.
I think if you can gradually move milk earlier in the routine, perhaps read a book (if its not too exciting) on your lap before bed rather than milk? or do milk, then PJs and teeth, then bed... ie. drop milk earlier and earlier in the BT routine til its gone. Then I reckon GW is possibly more suitable given your current practice.
Can you expand a little on what's happening at nursery? What are they saying to you about her? How comfortable to you feel sending her there? For me, your mothers' instinct is the key part of this - do you feel right leaving her there? What are your reasons for sending her to nursery? Are you working? Concerned about her socialisation? Can you find another place? I guess I speak from the experience of having DS in a daycare where he was happy and then going to a place he was miserable after we moved and it really did make a big difference to him. Had I not known he could be happy at daycare, I may not have taken him out so quickly but he was much better within a week or two of leaving that daycare for another.