I drew evenly-spaced dots on the underside of the egg, taught her to pin the pieces together, and let her go.
When she had finished, I tied the knots and she chose the decorations. Her first choice was fabric markers but those don't work well on felt, so she picked iron-on patches instead. I did the ironing and she happily went off to fill her egg with butterscotch candies.
I like that she picked a flower and a butterfly-
both symbols of new life and (I think it might have finally arrived!) spring.