[Look, Rapunzel's best friend is basically a hedgehog too. She may have stumbled a bit with how she acknowledged a lot of Cass's feelings and it caused them a bit of strife, but she's learning how to deal with people like this. She gets it.]

That's all you can do. You don't have to be perfect at it... I mean, I was really awkward about making friends for a while. [Let her tell you about how she didn't understand what booing meant one day, or how often she stepped on Cass's toes in the early days of their friendship.] But it got better after a while. You just need to give it time.