Hi S.,
First, I HAVE to say something in response to the one responder who said at this point baby should be getting most nutrients from something other than milk. NO NO NO NO NO!!!!! Baby should be getting the majority of her calories and nutrition from MILK, either breast or formula until age 12 months!!
That being said... I would try a few different nipples. You could also look into the 'Natural Nurser' Adiri. It is more like a breast. Have you tried putting some breastmilk ON the nipple itself?
Also, what about trying to have someone else feed her the bottle. I know being a SAHM, you're probably 'it' during the day...but what about trying to introduce the bottle at night when hubby is home?
Keep at it...baby will get it eventually. You may also try giving baby some extra 'mommy' time. She may see offering the bottle as not getting enough mommy time. Nursing is very comforting to baby... the skin to skin etc.... Oo! Have you tried offer the bottle and giving baby as much skin to skin contact as possible????
Hope I offered something of some good advice. I know you are trying to do what is best for your daughter...we all are.