Imp's powers are weird. She's not invisible, she's forgotten/easily forgettable when her powers are active. As I understand and have interpreted it for the purposes of this story, that means that in person, Aisha's essentially undetectable, because nobody can remember her presence. In a video recording, she'll be just as obvious as anyone else, because that's after the fact. Likewise Brian doesn't forget she exists, just that she's present.
I'm not sure if this is the 'correct' interpretation or not, but it's the one I'm using for the purposes of this story. (And, really, most of the generalities, everyone understands, and most of the little details don't make much difference in 99% of cases.)