mostly, honestly, she just didn't get it? she worked in london and felt like she was doing "important stuff" and then moved to hollywood and felt like all she ever got called back for was... best friend in john green film and stuff she didn't connect to. she's pretty self-righteous anyway, so that's absolutely rude and annoying, but she was also diving head-first into a mental health breakdown that probably began eating away at her while she was filming, so that unpleasantness probably added to her negative vibes.