personally speaking her reaction will be the same regardless of BP. It sounds like she is incredibly selfish and quite juvenile and despite having BP is taking the p*ss. Having BP is no excuse for behaving badly. There is no other way to word this other than telling her, that's it. There is nothing more, if you want more go and earn it. She might well kick off and it might trigger some episode, but that is what Drs and Psychs are for. It sounds like you and your brother have more than enough to deal with. Telling her that she is loved making sure that aspect is reinforced but that he can no longer support her financially is all that can be said. How she takes that news is her problem and her responsibility, not anyone elses. How she deals with it is also hers. Take care of you and your family.