She's already run a CRF250L which isn't light, but comes in very close to the CRF300L and the KLX300. I don't see her going back that direction. In the process she's gotten some rides in on lighter bikes and has really enjoyed them, but she hasn't had the opportunity to ride them fully loaded. She's also gotten to try a few larger ADV bikes and she's giggled on them, she really hasn't taken to them, and certainly doesn't want to be lifting them in the wild. Also, the KTM500 service intervals aren't so bad if you are touring and not racing them, there's plenty of examples of folks riding them around the world without incident. Not sure which way she'll go but everything I've seen so far of what she's ridden points to a lighter bike in the next season. At least, that's my personal feeling, if she's buying her own bike.
However, as much as she's loved her Hondas, she doesn't seem to even be on Honda's radar at all. Royal Enfield loved having her on their brand and I'm sure misses her influence greatly. After them coaxing her into riding their prototype in India this past season, I could see them coming in full steam ahead to make her their ambassador and giving her something like the new 450. That won't be lighter, but it would be free with possibly some support for it along the way.