My daughter is 9 weeks old and until last week would not take a bottle at all. We started offering one at 6 weeks and for 3 solid weeks it was a disaster. Last week, though, the stars aligned and she found her groove. Here is my advice and thoughts:
Persistence! Someone other than you must try EVERY DAY to give her a bottle. It is best if you are not even in the house at this time. Make sure she is hungary but not starving and in a good mood. My daughter always wakes up happy so my husband went and got her from a nap and gave her the bottle before she even had a chance to see me.
Buy a bottle you think she will like (maybe one designed for breastfed babies like the Breastflow or Adiri nurser) and try it at least twice if not 3 times. Oddly, though, the only bottle my daughter will take is the Evenflow Purely Comfy - the least expensive, last resort bottle!! I bought every bottle out there before trying this one and, of course, this was the one! A lot of people swear by the Avent ones, too.
Check out kellymom.com or mothering.com/forums for other moms going through the same thing and their advice.
Good luck! Its frustrating, I know. Patience and persistence!