Oh I'm so sorry to hear.
Well, she's older and more likely to realize it tastes nasty.
Try the sippy and try varying the temperature. Some babies will take it ice cold just for the novelty of it. Carnation Good Start tastes less nasty than the others - maybe she'll like that one better?
What I would recommend at this point is to start pumping every couple hours again like a madwoman. Baby has to eat, and you can't really blame her...have you tasted the formula? Mine did the same thing, only thing was that I could NOT pump enough even pumping 8-12x a day...very frustrating. I was afraid he was going to starve...