It sounds like you are a good sister for standing by your sister through this hard time. Your sister most likely can't control what she says and does when she is manic. I wouldn't take any of the manic conversations personally.
However, your sister is responsible for getting on the right drugs and keeping herself stable. In an earlier post about your sister you said that she drinks alcohol while on meds. Alcohol will decrease the effectiveness of most mood stabalizer. And the alcohol itself can intensify the bipolar symptoms. So it is her responsibility to stop drinking. If she can't stop on her own, then she needs help to stop. It can take a while to find the right combination of medications that fits each individual. You might have to search around for a good psychiatrists that can work well with your sister. Good Luck!