Should I report this Facebook group?

[poιѕoɴ ιvy™]

*I asked this in the Adolescent section. I wanted a teens opinion and a grownup/parents opinion*

On Facebook, between the ''popular'' kids, someone made a group that says "KaitlynForNever" (the name was changed, btw) and I *think* it's a hate group. This girl is not well liked through my school, it says "ForNever" at the end, and has a picture of her. It's a closed group and I have to join to see what they post. There are about 12 members, and they are all the popular kids, including those who I thought were her friends.

Should I report it? Should I tell the principal? Should I do anything at all?

The girl, Kaitlyn, has been kinda mopy at school, if I ever see her at all (meaning she isn't at school).
The girl who is targeted, Kaitlyn, is one of the ''popular'' kids. I have tried being nice to her in 6th grade, but she just did not like me from the start. I honestly don't care if she hates my f*cking guts, it's not right to bully.

I don't want to join it because then someone else might report it, and they will see I joined and I might get in trouble. I just screenshotted the page and I'm going to print it, and I will talk with my guidance counselor tomorrow or sometime this week. Thanks to any answers!