I am 6' tall and started out on a Yamaha 250 street bike 30 years ago. Yeah, I outgrew it quick and went to a 550 Seca, but I really think a woman should start on a small bike.
Buy a used one, let her learn, then sell it and buy her a larger one if she feels comfortable.
You said "Highway use", but I wouldn't have her on an interstate on it. In fact, I'd stick to backstreets with 45MPH limit as much as possible, or country roads with less traffic.
I learned in a parking lot.
If she's never ridden a bicycle with front/rear brakes... she has a lot to learn. Learning how to manipulate those is the hardest part of being safe.
Ron M. ('59 is my birth year)
Originally Posted by Boxerglocker
“WTF?! How a cheap can an old, the old fart get?!”