Good for Ann! Dirt biking is so much fun! You have selected two great bikes as choices--she should have a good experience on either one. I started out earlier this year on a TTR125L, and I absolutely loved it--lightweight, plenty of power for my level of riding, great handling, stable suspension, and very forgiving of my many, many mistakes. The bike was very non-intimidating and allowed me to focus on my riding skills, instead of struggling with "bike issues". I would finish each ride with a big grin on my face, telling my husband, "Yamaha must have built this bike just for me!" At the end of this summer, I purchased my CRF230F--as my skills improved, I wanted a taller bike for my 5'7" frame, and I wanted a bit more power for climbing steep hills. I could not be happier with my CRF230 (stable handling, solid power going slow or fast, etc.), so I'm sure that the CRF150 would be just as terrific for Ann. And the electric start on either bike will be really great for her to have (although I had a kick start on my TTR125L, and the bike started with the first or second kick every time). Good luck, and let us know what Ann ends up getting!