@Miranda250 I've accepted guests with no reviews, and I've never really paid much attention to whether they had verified ID, as that really only means they've uploaded a driver's license or something, which is zero indication that they will be a good guest. I guess it does show that the guest at least took the time to fill out the information on their profile and upload ID.
I've also had guests who had had accounts for years and no reviews. When I asked them about that, it turned out to be quite innocent. One had had 2 Airbnb stays but her hosts hadn't bothered to review. Another had joined planning to go on a trip, but it had never panned out. Another had stayed in lots of Airbnbs, but she had always travelled with her husband, booked under his account, this was her first solo trip. And she liked having her own account- she liked to peruse Airbnbs all over the world, like you'd leaf through a travel magazine.
All of these turned out to be great guests. But they had also taken the time to do a bit of a profile write up about themselves, had real profile photos of their face, and good, informative communication with me when they requested to book.
So no reviews with long-standing accounts are not always a bad sign, but certainly something to take note of and nothing wrong with asking them about it.
I also don't use IB- it is the way a guest communicates with me, how long it takes them to answer, if they answer any questions I asked or ignore them, that is what I base my feeling about whether to accept a guest or not, coupled with any reviews they may have.
But I have a private room home-share listing- I don't have to be nearly as vigilant as off-site hosts because there's really almost nothing guests can get away with in a home-share. I guess they could nose around in my things when I wasn't home, or steal something they think I wouldn't notice right away, but that has never happened.
I would just dialogue with this guest until you get a sense of whether you feel comfortable or not that she is being honest about her intentions and understands and agrees to your house rules.