Hmm,her devices could be secured in such a way only certain people could access sensitive information within them. Otherwise indeed, the information would be pretty safe in Celena's memory.

That makes sense then, Celena could tell Kang easily enough if said spy doesn't notice them, as long as said spy doesn't get noticed. They may get a telepathic question if they do get spotted though.

Such memory can be used to know what's out of place in a situation as well, mixed with her 'True sight' ability she can be useful in spotting things that don't belong if she's been to a place before, if that would be handy at all?

Look forward to hearing back then, this is sounding a really interesting idea.