"I don't know... Trahearne didn't seem very sure about it before. I don't know how either of us would fit in..."

Because now she has this bizarre mental image of herself and her tree friend sitting drinking tea and reading books while...while all sorts of debauchery goes on around them. Okay, that is enough to make her giggle. "Oh dear. I'm not very good at this socialising thing. But maybe I could try. It might be fun. Maybe?"