Heyo, first of all im seriously irritated by the unclear definition that experienced growers on this page have sometimes.
Pruning is removing branches, buds or stems.
Defoliating is removing leaves for multiple reasons: airflow, lightpenetration and pest/mold/overall plant control.
I would do a heavy defoliation to your plant when she finished the flowerstretch. Some fanleaves, especially low will Support your plant but also take a lot of energy for themselves since they never stop grow. I would defnitely cut them to ensure you boost that energy into buds through sugarleaves sucking it directly to where it belongs. But also keep a healthy amount of leaves on your plant. I usually start at the end of flowerstretch, when pistils show. Then do a heavy defoliation and then daily take a leaf or few of if they block some buds or a just too much layers. At the end of flowering my plants barely have any fanleaves, but i also dunno how to keep them all my space is filled with buds lol.
Happy Growing