What do you think of me telling my friend everything that the girls were saying about her?
What makes you want to tell her? Is there a reason?
I want to hurt her and make her feel bad
I think that it is good to tell your friend when someone speaks bad on them, however there is a time and a place to tell her. If you are only telling her because you want to hurt her feelings, that is not okay.
Don't talk shit.
It's wrong and hurtful to spread gossip. The right thing to do would be to stick up for your friend when you hear someone talking about her.