I'm sorry you are having problems getting your baby to take her bottle! It could be that she is not having a growth spurt right now and doesn't want much of anything. Use the vitamins your dr. recommends. Have you tried a different kind of sippy?

I had (well, still have sometimes) the opposite problem with my 13 month old. I've always breastfed him, but he doesn't like ANY food (whether it's baby or off my plate). Finally right before he turned one he started eating some stuff, but not much. I've been trying to wean him for two months, but so far have only been able to replace one feeding with milk, and even then he won't drink much of it (no matter if I use a bottle or sippy). It's very frustrating. But as long as your dr. thinks everything ok and she isn't losing weight, it's probably just a slowdown and will pick back up on her next growth spurt.