@Tracy792 Yeah, she could have been scamming, or she just might have been a clueless newbie. As far as I'm aware, Airbnb lets guests know what are acceptable forms of payment depending on what country they are located in, and I don't think debit cards qualify, although they might.
Whenever a guest starts trying to make their payment issues your problem, it's usually a red flag. They might just be clueless, but do you really want a clueless guest? If they can't read the Airbnb payment info, and follow the instructions, are they going to read your listing info and house rules and pay attention to them?
It's the same as when guests start off by asking for a discount, telling you they are a poor student or that it's a bit over their budget. Their financial situation isn't any of a host's affair, and why would they think a stranger would have any interest in that? If they can't afford what you charge, they should look for something they can.