J.C.
Let her keep her bottle- she is still a baby! If she is laying down and falling asleep fine then why change it. Eventually they stop needing to nurse or take a bottle at night- She won't be doing it when she is 5 so enjoy giving it to her and don't listen to peer pressure or the dr.. I have 2 girls ages 4 and 5 and I never made it an issue and so it never became an issue.
One last thing, the nuby sippy cup is much like a bottle and if it really bothers you- try switching to that for only milk and keep your other sippy's for water and juice.