It's just normal teen/pre-teen stuff.
She's friends with a few different girls. Hangs out with one a bit more for a few days. Then one of the others tells her Girl 1 has said xyz about her. Girl 2 says that girl 1 is saying stuff to try and stop dd been friends with girl 2 as girl 1 wants to be best friends with dd.
So then girl 1 denies it. Dd doesn't know who's fibbing, playing mind games. Either girl 1 is saying stuff about dd which isn't true. Or girl 2 is fibbing, making stuff up. Both seem very nice and both want to be friends with dd. dd wants to be friends with both.
But it's constant, not just an isolated incident. They manage to put one thing behind them and then it's another similar situation. I'm worn out.