Gossip Girl episode 10

In this episode, Cece (Serena's grandmother) comes to visit the family. She forces Lily to push Serena to be in the Cotillion Ball. She said that if she's doing it will be with her own therms.
Cece meets Dan and she tries to convince him to leave Serena alone, she even tries to buy Rufus. Dan tells Serena what was happening and she really got mad and tells Dan that he can't go with her. Instead, she goes with Carter. Carter has a dark past with Nate and Chuck.
Serena realizes that her mother changed her presentation card, but she doesn't know that the responsible was Cece. carter helps Serena to screw her presentation and Cece almost get crazy with that.