hi, I just notice this. my 10 cents please.
my daughter did tend to refuse a number of feeds. and she did give me a lot of hard time. we tried one lc and la Leche guys too ( not sure you have this). she didn't want to latch etc etc.
here is what I learned and wanted to pass on to you. (of course, you do want to see if she is a little sick or eliminate any other serious causes. but once that's eliminated, like you said....)
take it easy, feed a little more rarely (as she wants). never help her latch on, she can do it herself. try to relax and do not force feedings. may be even go away for a little if the feeding goes wrong, let your husband take over etc etc. when you are more relaxed, baby will be more relaxed and may want to eat.
caveat, you gave bottle, so may be, just may be, she likes bottle little better now, but that changes. mommy is so much better, she calms with her touch (when she IS calm). so do stay calm please.
we never gave a bottle, went through ton of stress. never had anything to boost milk. panicked a lot, which did make it worse. no one found any problem. as long as baby gains weight, RELAX please, baby eats enough. baby will never ever ever let you underfeed them , they will let you know.
i went through panic attacks just like you,but now she is 2 yo and I wonder WHEN she will stop

and I have no breast to speak of, so just relax. feed when she needs. by 4 months it became a breeze. as long as you offer when She wants as long as she wants and stay calm, it should help ease tension.
also, what did help me, I think to keep milk supply was feeding on one breast till she "emptied", then to the second.
another note, you will never pump same amount of milk as your daughter will suck out. don't measure. relax.
the answer from most wise people (but felt like insensitive one at the time of difficulties), if she gains, she is good. so I weighed her fairly regularly (may be once a week or every other week for few months).
good luck! I hope this helps a little, I know how scary it can be in the midst of it.