I had the same problem. Here are some things that worked for me.
1. Wait until she's really hungry. I had heard to try to give my son the bottle when he wasn't hungry so he could get used to it. Then I read something that suggested that he has no incentive to eat something he doesn't really like if he's not hungry.
2. Put the bottle in and hold it there, even though she will scream. After a few seconds or maybe even a minute, she will probably start to suck. I know it's hard to hear the baby cry, but it works and it is for her good. She'll realize it's not SOOOO bad! :)
3. Warm the milk and, here's the important part, at least for us, warm the nipple, by running it (sideways) under warm water and right into the mouth.
4. Smiling and encouraging her rather than looking stressed and annoyed (which is how you probably feel!)
5. You could try experimenting with different bottles, but I followed a bunch of suggestions for different bottles, and it turns out that you probably should just stick with one so she gets used to it. However, my friend swears that her son would only drink from the Breastflow bottle because it is more like the breast. My son has done fine with the Born Free bottles once he got used to it.
6. Once she takes it, stick with it! It is so much easier just to breastfeed rather than pump and give the bottle, but you don't want to lose this skill once you've worked so hard for it. So "practice" once a day for a while and then every couple/few days after that.
7. I found that now he will only take the bottle from me. I think maybe it's because I'm the most persistent. But I think it's important to practice with different people.
8. Don't give up. If you're serious about this, don't give in and breastfeed when she refuses!
Good luck. Breastfeeding is awesome but it feels better to know that someone else could feed your baby in a pinch!