Hey, OP here. I thought I'd leave a comment just to give a tiny bit more clarity. After we went to the museum and took her for food, we asked why she said that. Turns out, she'd heard us talking about it and heard that there was a mummy there. So #1 was spot on! The next day in fact she went on to repeat what I read out at the mummy exhibit so there is nothing wrong with this girl's memory.