Aww, I totally understand your worry, lalo na first baby mo pa, a few of us went through the same thing with our toddlers at one year, ganyan talaga ang appetite nila sometimes! Since she's active and playful, that's actually a good sign, pero since she's stuck sa weight at ayaw mag-bottle, definitely check with your pedia na para ma-assess nang maayos kung sufficient ba talaga ang intake niya or if there's something else going on. Minsan kasi picky lang talaga sila sa bottle pero okay pa rin sa breast, o baka need lang adjust ng feeding schedule or try different cup options instead, a friend of mine tried the soft spout cup at sobrang laking difference!