“A forever alone.” My feelings is hurt because I’m a “forever alone”, but my advice is solicited. Just saying. Sometimes you need advice from someone observing.
Oh, and she has to realize just how much her brother actually loves her. I know he’s not really her sibling, but she’s taken part in raising him. Her running away from him could make things worse. I think she’ll ultimately try to deter him from the path of tyrant, hopefully.