Bottle Guilt

Anyone have any good advice about taking away the night bottle? My 16 month old still needs 1 bottle at night about 1/2 hour before bedtime, and she drinks it in 2 minutes flat. She won't do the same with a sippy. Why do I feel so guilty that she's still having a bottle? I think it may be that her ped. has been telling us its not a good idea for her teeth; but she loves it sooo much! And, she doesn't have a pacifier or any other comfort item, so I'm trying to justify it. however I do want to get her away from all bottles within this month...any advice? Thanks girls