@Catherine103 Ignoring your intuition isn't a smart move. Hosts' spidey senses usually prove to be correct.
I don't necessarily think the long-standing account with no reviews is a bad omen, as I have had 3 guests where that was the case, and it was all quite innocent- one had joined with the intention to take a trip, but the trip fell through, one had stayed at Airbnbs a lot, but with her husband and booked under his account- mine was her first time booking a trip on her own. And the 3rd had stayed at 2 Airbnbs before, but her hosts hadn't left reviews. In all cases the guests were forthcoming when I asked them about it, and all turned out to be welcome guests I would have again.
But as you explain it, there are other factors involved here. So I'd at least ask the guest some questions, and judge by her answers, if not just cancel outright.