You can always just pull the cranks on a regular bike for her.

I WISH these balance bikes had been around when my kids were small. The idea is you skip the whole training wheel crutch thing, and go right to pedaling. They teach themselves to balance, and get comfortable with balance AND speed, and the pedals come naturally, later.

The homemade way to make one is to put the seat all the way down, and take off the pedals and cranks.