So we were supposed to run the string pieces through a water/glue mixture then place on the wax paper and let dry over night. I didn't want to hear Rose complain about messy hands so I altered it just be string laying on glue. Turns out you need the water part, otherwise it just falls apart.
The bonus is that Rose, all on her own started making shapes out of the extra string. She was also making little scenes that only made sense to her. But in the end it was great geometry session!