<human>: Could you distill the essence of the text into 1-3 sentences?

This is my first post asking for advice, here goes! Me, 18f, her, 26f

Okay right off the bat, I did not label her as bipolar, she told me herself, was diagnosed, and is on medication for it. I've read a book about bipolar people, "I hate you Don't Leave me" but I can't claim to know what to do in this situation. She's a really cool friend, we have a few shared views, and get along okay in small bursts. I can handle anyone in small bursts. 

Lately she's been leaving a lot of uncalled for criticisms, veiled insults, like "I wouldn't do that if I were you but it's your art piece but wow that lighting is bad" or "lol why would you do this?" or "if you're bored of me just tell me but I'm sort of used to it anyways" Now I want to emphasize I did not in any way change how I act towards her, or to anyone, but something tells me she's really resentful towards me or to something I did. I don't know if I should communicate my worry or if it will be like picking at a scab and making it worse. As the one without bipolar disorder, I have the responsibility to maintain maturity and calmness. I know bipolar people see things in extremes, so maybe something I did was taken the wrong way, or maybe she is testing me to see if I still like her as a friend. I really don't know how to react, but the comments are getting on my nerves. Should I ignore it, or talk through it?
<bot>: Bipolar friend is getting a little aggressive/resentful towards me, and I don't know whether to confront her.