Again, no. Just because the result turned out okay, the way how it was done does not become good (or scientific). There is no reason why it could not have been done in two persons.

And btw: applying it to herself is a PR stunt. Just like politicians drinking water from Flint or Fukushima. Though iIt may even be that she had to do it because she would not get FDA permission. If not, still I would not thank her. She put a life (or health) unneccessary at risk, if it is hers or someoneelses does barely matter at that point.