Sacred Haven of Debauchery

If that's really the case, then she's a daring woman, and I respect that – to test it on herself without clinical trials on test subjects.

Come on, daring. She took a strand of her hair and created an almost immortal being from it.
Seriously, I don't remember the details anymore, but in general, it's unlikely that you can just undergo gene therapy against aging with the current level of technology. Even with mice, it doesn't work that way; they either change the production of enzymes or something like that. And they achieve pretty good results, yes, but that's on mice...
To undergo gene therapy... Seriously? You have to infect the entire body with a special virus so that it changes every cell. This is not only hard to imagine, but also... Okay, in short, talking about safety is pointless; it's just nonsense. In China, genetic modification of a human embryo at the stage of about 10 cells is the latest scientific achievement. In the rest of the world, people are not genetically modified at all. In general, nothing threatens the woman – for the simple reason that no experiments were actually carried out on her.