" I don't think any of the major players see much value in giving her a new bike. "
Isn't "any press is good press" still true? Is there a reason she doesn't have a sponsored ride this time around? The 1987 600 Tenere is about 380 pounds wet, The KLR650S about 490, the Honda XR650L about 350 wet, the DR650S about 370. The Husqvarna and KTM are both somewhat lighter.
An "Open Class" bike eliminates power issues and really eats miles, but is more demanding in the slow stuff. Passing should be greatly improved, even with full travel loading. It'll be interesting to see how this evolves.