In my eBay watching experience, 1 BRs sell for less than 2 BRs. Quite a bit less. However, in the current environment, there may not be much of a difference. In some cases, the 1 BRs don't even get a bid. Something to keep in mind when you need to sell the property - and that time will come for each of us. If it's harder to sell, it's that much less valuable, in my opinion.
2 BRs command higher maintenance fees. Sometimes not that much more than a 1 BR, though. If the property is a lock-off, you can get 2 weeks of vacation for the one maintenance fee. Your living space is often larger with a 2 BR too. I'm pretty sure that a 2 BR gets a higher exchange value if the seasons are comparable. However, peak season for a 1 BR vs. off-peak for a 2 BR I can't tell you how they would match up. With prices as low as they are now, I'd suggest waiting for a peak season 2 BR. If there is one available, have her make a low ball offer and see what happens. And check out eBay.
IMO, a 2 BR is the way to go. But each individual needs to make their own informed decision.
Good luck.
Sue