Hello there! So after extensive review and discussing it amongst ourselves at a team, we believe we fully understand the situation and what you’re asking for the AU and have come up with a resolution.

With the explanation provided it’s fine to have her keep her AU memories of her AU life until the accident. It’s also fine for her to be dealing with anterograde amnesia if that’s the route that you choose to take.

While it’s fine for you purchase a regain of her analysis ability with bonus points as per our regain items rules, for something as canon-specific and almost supernatural as an SHSL skill, that is something we would prefer be paired with a memory regain as well.

So with that being said, yes you’re allowed to do this but we would suggest it might be best to have the amnesia cured via an alternative method so that she can start regaining her memories and recall that she has a special ability, at which time with enough points a SHSL regain may be purchased. This could serve as an interesting starting point for building CR and giving Ryoko/Junko motivations in-game to work with others and seek out other people.

We hope this helps and answers your question!