My Grandma has finally pushed me away

My (19f) grandma is a horrible person. She pushes most of my family away with her rude and unsolicited comments. Which I think is ironic because she claims to be “one of jesus’ favorites. Anyway, She chops them up to her being “brutally honest” and her “just speaking her mind” but she has no filter. When people call her out on it she just says that it’s not her fault she speaks her mind. None of her grandkids, except a small handful, even talk to her. And her kids (my mom, tias and tíos) barely tolerate her. Me and my grandma have had arguments and disagreements before, but she’s the kind of person that will suddenly act nice after an argument (or just being plain mean) with no apology. Last week she came over to my house and I had no makeup on. The first thing she said to me was “oh my gosh you have so many zits on your face” even though I told her i’ve been struggling with acne for a while now. She went on to make more comments about it which kind of hurt my feelings.What really got me was when she said “If I were you I wouldn’t even go outside”. I hate my acne and i look at look at myself everyday and wish that it would go away overnight. and to hear her say that was like a knife to the chest and i immediately went up to my room to cry. I haven’t talked to her since and she keeps trying to call me, but I don’t think I could ever forgive that. She’s also the kind of person that if u call her out on something she did, she’ll twist the story and go talking behind your back to other people about how you did her wrong in some way, so it’s not like I can confront her. Sorry if this post was long, I don’t have anyone I can talk to about this. Partly because i’m embarrassed and partly because I think i’d start crying again if I said it out loud.