I think the orange peel quilt is made with squares, this one is equilateral triangles with the curved 'petal' on the edges. The F&P wagon wheel is close, but it uses straight cuts instead of curves.
The one your mom made is called "Joseph's Coat''
Here's one pattern:
http://www.robertkaufman.com/quiltin.../josephs_coat/
however, there are many different ways to construct this to get the effect. Some are paper pieced, some english paper pieced, some are applique etc.
You will need to google 'joseph's coat quilt pattern' to decide which one you want to do.