I've had (almost) as many bikes as cars. I've ridden my Honda V-45 Sabre 750 coast-to-coast (I actually have a matched pair of them now, but the second one has never been out on the road with me, except on a trailer). I used it four-seasons in my college days and ran it through snow-storms that had Subarus running at half the speed limit.

I have been riding for decades (and boy are my arms tired!

), and I've ridden everything from a 100cc trail bike up to a Harley V-Rod. I've also owned a GL-1000 Gold Wing, a Kawasaki Z-1 (currently in pieces, and awaiting a top-end rebuild and turbo upgrade, along with some severe bodywork (read as: new tank, custom gauge-pod, side-covers, and custom tail-section; this is old-school stuff, when fairings were for touring bikes and 'plastic' wasn't something you wanted covering your engine

), and a ZX-11 (fastest production bike in the world
ever for several years -brag,brag,brag). All of those open-classers weighed 600 pounds or more, and the 750 Honda came in at 534 pounds curb. I weigh about the same as Rose, and am a little shorter. The 250 is WAY too small for her, I agree with you. If she already knows how to ride though, then she may well know what is comfortable for her so far as the bike's capabilities, and may not need that 'room to grow' that other prospective buyers might need to consider. I spent a few weeks with a little Honda 250 Hawk, and that thing was a blast to putt around on, although it could barely achieve 65 or 70 MPH. I wouldn't say no to something like that again. I also have a little Kawi 550 GPz, a skinny little bike that feels like a ten-speed bicycle that can hit 0-30 MPH in under one second flat, and we have a pair of ZX-6Es (not mine, although I ride one of them from time to time, the other one stays locked away) in the family too. Yamahas are the only one of the Japanese 'Big Four' that I've never owned, but that was more an issue of opportunity than anythings else. They are usually the best-sounding bikes on the road, IMO, and I have nothing against them. I don't tend to like cruisers much myself, and I have ridden several of them over the years -I prefer to be sitting up straight, maybe leaned into the wind just a little, with me feet planted under me -I can tolerate having them behind me, but in front of me?

No. But that is just preference.
Whatever she gets, you should post up some pictures for us when you have the time.

Are you planning on riding with her, either on your own bike or two-up?