Originally Posted by
Bornco
You might consider using shorter cranks.
Jack
I agree with Jack. Unless her range of motion is fine, reduce the total motion required for awhile. My suggestion is to get crank shortners that allow you to change the position of the pedals and can slowly increase the equivalent crank arm length by choosing different holes for the pedals.
Tandems East Cranks & Pedals
Half way down page will be a picture of a couple of child crank shorteners. They add a bit more to the width of a normal crank arm.
Ease in to it.