Dealing with a parent on the spectrum

You guys, I’m at loss for what to do. My brother is on the autism spectrum, and just from all that I know, I totally see signs of it in my mom. (I work with children on the spectrum). I’m having a hard time dealing with my mothers actions... she will be mad at me about something...and I have no idea she is mad until I realize she hasn’t talked to me for 3 days and I confront her about it..and usually it’s something sooo insignificant that she is mad or upset over, or it’s something in her head completely. I can’t help but to get mad..any advice? I’m in my late 20’s and it’s mentally taking a toll on me... she just doesn’t get it