well i think it's bcs she can't see everything clearly, she think that orpheus like his cousin and make plan so that they can be together but in the end it just misundesrtanding (well i think it's his fault to not clear everything right away) and he said that he want everything go back to normal .. she can't accept it right away and want to consult with claude so she ran away to him to clear her mind
and in my opinion she felt guilty after what have she's done to everyone, hurting diana,acted like a bitch, and annoy the servant in that house and after all of that, she knew that what she do is wrong and orpheus also knew about why she acted like that so basically it acceptable that she running away... even i was in her shoes i will run away too lol
I'm sorry but why is she running away??? Like what's with all this unnecessary drama can she not communicate like a normal person?? Don't run away in a freaking storm for no reason and them incite a whole new can of drama seriously