Trike training

Should she be able to pedal yet?

Ella has a Barbie trike, but I can't seem to make it go. She may be a little too short to reach the pedals. I'm wondering if she needs a different style, where she sits more on top of the pedals, instead of having them out in front?

For now, she enjoys just pushing it around the house and basement, sometimes with Alex along for the ride. I'm hoping we can have her pedaling by spring.