12 month old sleeping?

My daughter just turned one year old, and was sleeping from 8:30pm till about 8am in the morning straight without waking up. Well then we had 2 weeks full of fevers due to 2 different things and also she teethed all 4 molars in those 2 weeks. It was rough and I was up a lot with her during the night when she was sick and running the fevers. During those 2 weeks of sickness she lost 2 pounds so her pediatrician asked me to start middle of the night bottles again. Now that she is healthy she is waking up at 3:30 every morning for a bottle. Only a 4 ounce bottle so she must not be that thirsty. I have tried the cry it out method, also have tried giving her a sippy cup, and after a few nights of no sleep from my little one I gave in last night to the 4 ounce bottle and she drank it, and I put her into bed and she put herself back to sleep. She puts herself to sleep by herself, naptime and bedtime, and that middle of the night feeding she will drink the bottle and put herself back to sleep, but if she doesn't have the bottle she screams for hours. What do I do? Is it ok for a 4 ounce bottle in the middle of the night? How do I break her?