Ex-friend that was then a co-worker sent me passive aggressive message after nearly 2 years. Should I tell my supervisor?

So this is incredibly weird and could be very long but I have no idea what to do so here goes.

From the 8th grade to the beginning of senior year I was best friends with this girl, I’ll call her Wanda. We were both interns at this summer camp 2 years ago, then after that summer at the beginning of the school year I completely cut her off because I was tired of her manipulating, taking advantage of, and lying to me. She doesn’t agree, that’s fine. The following summer, I am a full time employee. This is a seasonal full time position, she is not there, she wasn’t old enough to work there yet. This past summer she was there. We never ended up working directly together (thankfully) but she was still around and we would occasionally have to interface. All of our extremely brief interactions were neutral and professional on both side (except for one time she was passive aggressive). I never said anything negative about her, exclusively neutral or positive things (ex. she got strep at one point but we didn’t know why she suddenly left in the morning and so frantically, I said “whatever happened I hope she’s okay”) and would just avoid having to interact overall. Tonight after not talking to her or really thinking about her (outside of the extremely brief work interactions like “are you using this classroom at all today”) for I think going on 2 years she sent me a very passive aggressive and manipulative message to a group chat including the only mutual friend we have saying a whole lot of mess. I want to just completely ignore it and move on but she specifically mentioned things about work and our coworkers. She said: “Don’t believe for a second I am the only person who feels this way either. When you hurt people with your words in the way that you hurt me, other people see that and develop opinions about your character based on that. I assume you understand yourself as a person who’s gifted in pattern recognition, and I implore you to recognize patterns in your own behavior. Just from hearing about other coteachers experience with you for example, I can recognize a lot of patterns in how you interact with people then vs. now. I know that admitting that you were wrong is not easy but I also really wish you grew more as a person” Coteacher is equivalent to co-counselor, our camp calls it’s counselors teachers. I did reflect on this because I’m personally very concerned with the idea that I was ever unprofessional or rude to any of our coworkers, but after really thinking about it I doubt this is even true at all. All of the staff was very nice and chill with me and everyone I worked with directly expressed to me that they liked working with me or were just okay with it. This is something that she would do before where she would try to tell me that a bunch of OTHER people also have a negative opinion of me or whatever, but wouldn’t say who or even what someone said while withholding who said it. My concern is now that she had brought work into this, that she’s going to continue to bring work into this. This excerpt is a part of a longer message that says a lot of specific personal things. I feel like I should maybe tell my supervisor about this, because while neither of us are currently employed there because it’s seasonal, basically all previous staff are welcome and encouraged to come back for break camps and the summer camp. I don’t like the idea of her doing weird catty stuff and spreading rumors to coworkers over what is frankly, old high school drama. If I SHOULD message my supervisor, how would I even go about this? I don’t want to look like a weird problematic college kid who’s bringing crap from high school to my boss to snitch on someone. But I also feel like my supervisor should be informed if something like this is happening with staff. We did this past summer have an issue where staff were having inappropriate conversations where people could hear them, and this was mainly about camper’s and interns hearing it, but I’m also now wondering if that was also about staff talking about staff. I sincerely apologize if this is not an appropriate post for this subreddit I have NO IDEA where else to ask.