From June/July this year, Pedego maximum speed is 20. Older bikes have a max speed of 24.9. All of the bikes have a controller top speed setting adjustment on the controller (see youtube videos!), and you can adjust the top speed (on my bike, up to 24.9.)
In my own experience, I generally don't exceed 20mph of assistance in either recreation or commuting (2500 miles on my bike and counting). Very rarely. I hope you and your daughter can ride some bikes to get a sense of the riding experience and if this works for you.
I'm not a dealer or Pedego-related business person, just a happy Pedego cyclist. We are a 4-Pedego ebiking family.