M.S.
Time for some sleep training! Start tonight since its the weekend so the 2 worst days will be on the weekend. She wakes up in the night out of habit b/c she knows you will come feed her. She does not NEED to be fed in the night, she WANTS to be fed in the night. Either pick a CIO method (like Ferber) and roll with it, or at the very least stop feeding her when you go to her. Give her a bottle of water. She wont be happy about it but after a while she will realize its not worth waking up for anymore.
How much total sleep has she been getting? It is possible she is overtired? It sounds wierd but overtired children have a much harder time sleeping through the night. When my baby starts waking at night, I usually respond by moving his bedtime earlier by 15-20 minutes for the next few days and it normally helps stop the night waking.