"So have the Borg," in a manner of speaking. The Collective possessed knowledge going back to some of time's earliest moments thanks to their assimilated knowledge. She could recall some of it — that which was deemed relevant, of course. The less important memories were, like much of her childhood, lost forever. Deliberately forgotten.
"You are not bothering me," Seven countered. "Were you considered an annoyance, I would have resumed my work or asked you to leave. I have done neither. I find your questions to be... refreshing. You ask. Not many do."