Leah my daughter is 4 yrs old and just like you I had the same problem of the bottle and waking up in the middle of the night. This problem is all up to you. You are the one that is going to decide, "How much longer can I deal with this?", if you are ok with waking up 6xs a night and you are fine with it then its ok. I decided I couldn't deal with it anymore. My son is 1yr old and sleeps almost through the night and his big sister wakes up 4xs. At 3yrs I had a talk with her. I told her she was a big girl and big girls sleep more at night. Her last bottle before bed time I would tell her just like your husband told her this is the last bottle no more until morning. Of course that did not happened, so what I did was decrease her intake to 3oz per bottle. My daughter would wake up at 11pm, 230am, 430am, and 620am. My son would wake up only at 420am. I said to myself this is crazy. So what I did when she would wake up at 11pm for milk I would tell her to go back to sleep in a firm voice no more milk and she would cry so I would rub her forehead lay next to her, give her kisses until she would fall asleep it lasted around 2weeks and the waking up at 11pm was over. Then she would wake up at 230am and I would to everything over again and sometimes it would work and other times it didn't. So I would give her 2 to 3oz of milk. Of course she would want more but I would tell her no more and after a couple of days she got use to it. Well now she is 4 I told her no more bottle you are going to school in 1month and big kids that go to school do not drink of the bottle and now the only time I give her a bottle is at night before bed time and sometimes she sleeps through the whole night, but sometimes she will wake up around 620am for milk and I only give her 2 to 3 oz and she only drinks only 1oz. I know its the hardest thing to do but now I'm getting more sleep and I'm loving it. I live in Florida so i always try to stay busy with them pool, park, story time, the back yard and they are ready to go at night. But so am I. I wanted to share this with you because i feel we both share the same feel and pain of waking up so much during the night. But this is how I dealt with my situation everybody is different. Oh, when she does something like drinking 4 bottles instead of 6 tell her I'm so proud of you or if she starts waking up less tell her very good princess you are doing a good job. My daughter is into the princess so I tell her, "Princess sleep through the whole night." or if for some reason I catch her with her finger in her nose I tell her, "A princess does not dig her nose."
Or give her little surprises when she accomplish something.
Good Luck with your daughter, but I see it like this they are only this age once enjoy them, then they grow up and fly. Best wishes.

johanna machado