Charleston is super risky. This hurricane keeps tracking to go up the east coast. But maybe she has family there she wants to be with? I guess it break up and be weaker too.
Currently it shows that Dorian could be past Orlando and into northern Florida by Wednesday morning, but earlier today it was thought it would still be in Orlando on Wednesday. I'd probably book through Thursday to be safe.
It will be stronger on the coast when it hits. Could be a 4 on the coast but only a 1 when it reaches Orlando, so that's something to consider as well.
Disney is great about keeping guests fed and entertained at the resorts during the hurricanes.