Good Morning Twinkles -
1) Have you tried lowering the seat and removing the petals so that she can ride it like a broomstick?
2) Will she use a razor scooter?
3) Will they let her ride a tricycle in the parade?
If none of those work, I would bring the question up with an OT. My don didn't learn to ride until age 9. the scooter helped him get his balance. And then he wept that he had wasted all those years 'not riding' his bike and missing all the fun.
This is definitely a gifted issue, and worth an attempt to figure out in some way.
Love and More Love,
Grinity
