hang in there, just keep offering it to her, i used an pop top bottle, similar to adult water bottles with a sucky lid thing that you pull up for drinking and down for closed, why not drink out of a sippy cup yourself and you partner as well, don't sweat, if you keep encouraging her then she will do it, when i stopped bfing i just gave her the bottle and she drank what she wanted and left what she won't drink, we only drank a small amount at first, we started at 14 months, i just gave her heap of cheese and yogurt, if you really want to stop the bottle just put them away and never get them out again, it will happen just be consistent