Large/Gross motor movements-bike riding

We are still working on riding a bike with lilybird. It has been a slow process. However, now she rides very well on a three wheel adult trike. She has gotten down leg and arm movements and does well with direction. Adding balance will be the next step to a two wheel bike. She is now using a push scooter well which distributes weight and goes by moving each food tandem in a pressing or ski like motion. She does this unassisted now. So this adds to her learning the next step to riding a bike. Balance.