C.L.
That happened to my son although he was younger--he was 3 months and had never really taken the bottle very well in the first place. I never did get him to take a bottle after that and he went straight from nursing to a cup at 14 months. Your situation sounds different since she is older and was taking the bottle well before. I would consult a lactation consultant; most hospitals or clinics should be able to set you up with someone. Good luck.