don't worry..when she get's used to the weight and how to balance it...she'll be ok.....get her to practice right foot brake, left foot flat and leaned on the inner left thigh.....good luck..

I am average height, and wanted to have my feet flat on the ground when stopped. Brought my riding boots to a shoe place, and they added extra soles (like 8 mm thick). Made a difference in my case. Didn't lose any feel of controls, but had to re-adjust the shift lever and the rear brake lever - not a big deal.