Lily left the group two days ago without a word for two reasons. One, she needed to get her race car back to New York. And two, she had provoked the Blue Clan solely on the Di Clan's behalf, but she wasn't about to deal with the consequences of that, and she was sure the others weren't either. Had she stayed with them, it was inevitable that trouble would come looking for them.
While she certainly never considered any of them her friends, they considered her a friend. Lily was not a person without ethics; she had no intention of burdening them with trouble. Thus, leaving had been a sure decision on her part.