Get the canned, pre-made enfamil stuff in the yellow/gold container (I think it says "our closest formula to breastmilk" on the cans). It's more expensive, but it will make the transition for you I bet.
My baby was exclusively breastfed and very picky - wouldn't even drink breastmilk over 12 hours old. And definitely no formula. I went out of town to perform at a symposium, was going to be gone all day and evening while baby was with grandma (she was 8 months old, had trouble with food, and I had gone back to exclusive breastfeeding on the advice of the dr.) I got to grandmas and realized I had left all my frozen, stored breastmilk at home in my freezer. I was beside myself! Grandma was an hour from the symposium, so it's not like she could run the baby down to get fed. I was completely freaking out and grandma said, "just let me go to the store and get formula and try it." I told her it was so not going to work, but another mom there turned her onto this stuff, and she ate it fine all day after a couple minutes of tasting and looking at grandma funny. I was thrilled. (by the way, if you taste the two, they taste totally different. powdered formula, to an adult's palette, is absolutely disgusting. Just the smell makes me want to barf. The canned liquid stuff has a funny aftertaste, but otherwise isn't that bad).
The other hint: have someone ELSE try feeding your baby the bottle while you're not around. Otherwise she'll insist on the breast. (mine still won't take a bottle from me, but will from others no problem).