Mmmm she is getting pedal bike as soon as I can find the time to make it.
I'd like it to have a rear disc brake to begin with, but to be honest I am thinking about sacrificing the paintjob on her current bike and give it flat mount rear brake.
when our kiddos migrated to a pedal bike I took out the BB / cranks for a while so they could get used to the size change.
then fitted cranks but used to carry around pedals and a spanner until they were confident enough to be on the pedals full time - didn't take that long before they were!
this is so awesome!
I used to experience the same fear when our kids picked up speed on their balance bikes.
servo operated remote control rear brake?