Didn't realise I forgot to post this comment. I rechose my House, picked the same colour scheme one as Violet's. Also picked the option that the PC says that they'll be there with her in Town, and for the event where you can help her levitate a book over, I chose the option which seemed the least flirty. However, she still refused. Not sure where I went wrong. I've now just save scummed to pick most of the options when the PC asks her out. Still got rejected. Meaning I probably screwed up earlier in the questline. It probably ISN'T a glitch, so maybe I've just been misunderstanding her dialogue and if it might've implied anything.