Hi again, I had a few thoughts.

You could try Pantley's No Cry Sleep Solution for Toddlers. She also has a website and I think she answers email questinos, so maybe see if she has any suggestions?
Soem people find a sleep book with pictures of their child can help - they read it with their kids before bed to get them accustomed to a new 'routine'. it takes a bit of repetition (and can be used in conjunction with verbal queues like Trish suggested).
The other idea was using an excuse. When I was pregnant with DD, DS went through this phase of refusing to bathe (will not have a shower) unless i got in the bath with him. After a while I was just too big. I told him this and remarkably, he just accepted it. He was a bit older than your DD is now, but maybe worth a shot.