C.T.
Well... K., I am really wondering why you are feeding your 1 yr old at night. At all??? I am sure you have spoken to your Ped. about night feedings. Unless there is a underlying issue. He/she gets a bottle every time they wake, why wouldn't they wake up to be fed on demand. They don't need to eat at night they need to sleep. I would reconsider what you are doing and why. He/she shouldn't even be using a bottle. I hope that these bottles aren't being left for her to drink and fall asleep with. But from what you said "give her the bottle," thats what it sounds like.
My 14 month old sleeps from 8-8, no bottles. Her weight is fine, if thats what worries you. She does wake up a few times during the night from time to time. Other times I don't hear a peep until morning. When she does wake up I go in and comfort her. Rub her back, give her her blanky, paci, sometimes talk to her quietly, then leave. I keep it short, and don't take her out of her bed. She understands its bedtime.
I think your daughter knows that if she wakes up she gets you and a bottle. The more you give in the more she will do it.
I hope you get a lot more advice on the subject, maybe other mothers know something more about what is going on. I don't think this is just a phase... but thats my opinion.