[X] Resentment. This makes your first real loss - the wire trap didn't count - and it's only cemented your opinions of Humans. Retreat deeper into the Forest to sulk.
Resolve is certainly the option where Trixie tries to have a training arc. I wouldn't care to bet on it being a successful one; given the reasons for it I think she's more likely to hurt herself.
But even in the case where it actually gets Trixie more power, that's... not really going to help, you know? There's always a bigger fish, and Trixie's currently on the path to provoke every last one of them.