We all die. The qualification for being defined as a miraculous healing is that a board of doctors must conclude that there is no way known to medical science that that particular healing could have happened.
It’s more strict than that. The miracle has to be of divine origin, not some trick by fallen angels, some thing only God could do.
To be cured of Parkinson’s, which is an autoimmune disorder, is not a divine event in my estimation, maybe this nun’s immune system recovered, or maybe she changed her diet? Of course, any correction of an autoimmune condition by diet alone would be considered a miracle by the AMA. :)