Suggest Treatment For Hair Loss After Using Accutane

My daughter has been on accutane for 4 1/2 months and has recently developed hair loss. He dr. wants her to stay on it for at least 2 more weeks for it to be effective. She is worried about her hair loss. Is 4 1/2 months with a great outcome with no acne a good trial or should she continue for 5-6 months?