I think Hollyhock being poisoned was more Tina’s fault than BoJack’s. Tina was literally hired to watch over what Beatrice was doing all the time since Beatrice’s dementia was rather advanced, what happened to Hollyhock was gross negligence from Tina’s part at the very minimum, because she was either not paying attention on the person she was supposed to be watching or she simply didn’t care that what Beatrice could be doing was wrong