J.L.
It sounds like a sleep pattern has been set with your daughter, so your plan should be to change it. I would work on reducing the level of interaction slowly so that she no longer expects to have her daiper changed, a bottle . . . eventually, she won't have much to wake for and she'll sleep longer before waking.
Just take it slow and make it as easy as possible for her. Her life is about to change in a huge way and you don't want her to feel like the new baby is getting all of mama's attention.