Does these sentences make sense?

I would say:

Regina and her group are not true friends. They are just pretty girls who became popular as a group. They all gossip and make fun of each other, and Regina is the worst of all.

Good luck + I hope this helps!
Gotta love Mean Girls

I understood the sentences, but I think you are asking if they were grammatically correct. The answer to that would be no. They are very oddly worded and the last sentence doesn't even read like a complete sentence. I think you might be able to get away with the first two...but they could all use some help. :/ On a side note, I feel bad for the group. It seems like they should talk things out...especially Regina. ;)
Hope I could help! God Bless! :)

The third one doesn't.