How can someone comment on a post after muting someone?

Someone was commenting on one of my posts. She was starting a lot of drama and just being an awful person to everyone. I kept reporting her comments and they kept getting removed. She finally muted me/blocked me, but she's still commenting on the post. I still get notifications that she comments, but I can't see any of her comments.

I checked the post on my roommate's phone, on her account, and the comments I'm getting notified about are all there.

How is she doing this?