In this timeline I don't think she really did anything that bad other than "pursuing wealth" which he said he didn't mind, and being mean to him in public.
Any actual harm was done by others which she even seemed to be reluctant about. Not to mention, in this timeline he started being mean to her before the reveal of Yang Shaokun, so in her mind it must seem like even if she hadn't done anything wrong he would still hate her.
I feel bad for her because she's only as toxic as every other side or background character in this type of series, but she gets it so bad because she happened to insult the mc.
But I think looking this tiny bit into the character's mind is probably too much for a mostly generic face slap urban xianxia like this