save yourself a lot of stress and move her straight to a straw if possible (depends on how advanced she is). . i assume you will continue to pump during day and nurse at night? so she can get her sucking then. The time goes by so fast. I wish I hadn't of spent so much time trying to figure out how to force the bottle on my daughter (similar situation to yours), once we sent her to daycare with a straw for her bottles, both she and the daycare ladies did much better. She actually drank quite a bit versus when they would try to give her the bottles. . .. good luck. I know how frustrating it is. There are tons of other tricks that you can try, i think I posted them awhile back, but honestly, the best thing for me was to give up and realize she needed nutrition from them and nursing/comfort from me. She is still awful young, and remember the daycare usually has tricks that work especially if you aren't there, so give it some time, but don't stress too much if you have to go to a straw. :) Some other ideas from my old post. . .
"I feel for you. I went through the same thing , 2 weeks before day care. Ugh. Make sure there is no smell on the nipples. Seriously, I couldn't figure out why my baby was all of a sudden rejecting bottles that she used to take no problem. I was trying to figure out "What changed?!?". Then I realized I switched dishwashing detergent. I went to smell the nipples and yep, totally lemony fresh due to Cascade gel packs. The cascade detergent had leached into the silicone nipples! I was using Electrosol before. I tried to handwash them, boil them- nothing got the smell out. So I threw them away, bought new nipples, and then she started taking them again. Now I ONLY handwash all supplies. This might not be your problem, but just a reminder to definitely look at anything that might have changed. I was practically forcing her to take the bottle and thinking if she got hungry enough she would eventually eat. Now I feel awful because she was refusing because of the nipple. . . glad I figured it out though.
Other things that kind of helped us while we were figuring it out
-set baby in boppy pillow or bouncer
- sit behind baby and only put arm in front of baby with bottle so he can't see you
- distract baby with tv (i know. . .but it did work sometimes)
-put bottle nipple next to baby's cheek while breastfeeding, when they take a small break or when you can quickly delatch them, do the switcheroo and stick the bottle nipple in fast. Sometimes they will be so in to eating they won't notice the swap until they are already sucking on the bottle- this helps them get used to the feel and understand that milk also comes out of this weird contraption.
-warm the nipple of the bottle by putting finger over bottle and holding upside down in the warm water for a few seconds
-put the nipples in your bra for a few minutes (before attaching to bottle) to make them smell like you
-check to make sure your milk tastes ok, perhaps you have higher levels of lipase and its effecting some batches of milk (soapy or metallic taste)- my milk only tastes good for the first 2 days. My baby was much more likely to drink if the milk was fresh. Once they get used to the bottle then you can try older milk (my daughter now doesn't care if it is a few days old).
-take baby outside to eat
-let baby play with bottle by himself, they are starting to use their hands at this point and sometimes just want to play with it before helping to put it in their mouth