A Knack for Potion Making

Severus Snape falls ill to an unknown illness. Even with the help of ngo, and other well experienced potion master's Dumbledore finds no success in curing his colleague. Except for possibly one more person, enter Alice Rose, having been to Hogwarts for only a few years before being expelled she lives her life in the muggle world as any regular muggle. Why has Dumbledore come?