[Houndguy]

It's best that your daughter take a motorcycle safety course and get proper gear! Even if your state does not require it - ALWAYS WEAR A HELMET!!!

I ride the highway everyday to work (35 miles 1 way) and found that my Kymco 500 does a fine job. Good storage as well. It's heavy enough to be stable getting passed, powerful enough to maintain highway speeds without issue and big enough where you will not be "sitting to low" in traffic. It's pretty solid and easy to work on as well if needed.

Suzuki makes a similar model called the Burgman 400 that should suit her needs. They are also a pretty common bike so you should be able to pick on up cheap.