J.D.
I allowed my son to have anighttime bottle until he was 2 1/2. if this is the only time she wants the bottle and isn't falling asleep with it in her mouth she should be fine with a little milk in it. My son is fine and he has had no teeth issues or anything. at about 2 1/2 we told him the the bottle was given away to a baby that needed it more than he did and he was fine with it. now he drinks froma sippy cup but still needs his bedtime milk.
I think it is more of a comfort.