Dificult choice. I like both of them, though I don't quite understand why regular Pure Energy can't be converted into GPE. I think I'll go with option one, but with a couple caveats.
If Julia is obliterated completely so that she needs to create an entirely new body, once she's settled in that younger body she requires a massive amount of energy intake (usually by eating a lot). That energy is then used to rapidly advance her back to her peak age. Also, even if she loses memories, the skills she's learned are instinctive and imprinted into her mind as much as walking or breathing, and so she will never lose those.