I started with my girl scout troop (Cadettes and Seniors.) We hand stitched a double quilt for an Iraqi War widow and I did a smaller one on the machine for his son. The girls really got into the project because of the personal aspect of it and the quilt was beautiful! My daughter has continued to quilt and has made several on her own.
I think maybe making a project for something special will really hold their attention and they will learn the quilting along the way. Ideas - baby quilts for local hospitals, lap quilts for local nursing homes, "ugly" quilts for shelters, etc... or maybe a Mother's Day gift or special birthday? Good luck! If you show her the creativity and love that goes into a quilt, I am sure she will someday carry on the tradition.