S.H.
The "American Girl" book series is great for this age.
They have one on friends and on emotions etc.
Just Google search it. You can find it at any bookstore or online.
It is meant to be read by the child and with the Mom.
ALSO though, it is something that needs to be 'taught' to the child, by the parent.
I have talked to my kids, since they were 2 years old, about "friends"... and how to 'DISCERN' people and their intentions... and their behavior.
My kids, know what is right/wrong, mean/nice... and what is "drama."
My daughter is now 8 & in 3rd Grade too. But she is a WISE thinker, about friends and who to befriend or not. She CHOOSES her friends and is not a "follower." She also knows HERSELF... which is a KEY thing, for a child to know. IF they know themselves, and are themselves, then this helps them to navigate... around and amongst, problem kids or 'drama' kids.
Luckily, my daughter has always chosen, nice stable girlfriends. If an icky girl tries to be mean, she speaks up and all her friends rally around each other. Or they will tell the Teacher.
There was one girl, that was... a really pushy attention seeking trouble-maker that liked my Daughter. My Daughter just did not engage with that girl and used neutral but firm talk with her. Distancing herself from that girl. As my Daughter explained it to me, she said: "Mommy, Sally is always trying to be one-up over somebody and makes sassy comments and she is selfish.... I don't like her, she gets in trouble too. She tries to get other kids to do trouble too, for her, to other kids. I know what she is up to."
This was, when my daughter was in 1st grade. She already 'knew' what that girl, was about. And she was right. I was proud of her.
So, you also have to teach your child, about people. And intentions. And about 'discerning' other kids/situations. And how to speak up, and/or tel the Teacher if it is a problem. And to tell, you, as a Mom.
You teach a child, about people, and friends and how to choose.
Thus... they will gain skills and aptitude, in how to NAVIGATE... in social situations. That is key.