Q.A perfectly healthy chocolate silk tree has lost all leaves in a week but growing new ones
Am providing pictures.Leaves are not turning yellow just dropping off.Too much water? Live in Myrtle Beach where we had hot weather for 2 weeks then rain which should be good

Certified GKH Gardening Expert
If this is a fresh transplant, then it is definitely going through transplant shock. It is not advised to plant in the heat, and it can result in the death of the plant.
Even though it would seem logical to water constantly in the heat, these trees are somewhat drought tolerant once they establish. There is a fine balance between keeping a young transplant watered well, and overwatered.
It is best to plant these when it is cool, but there is still a good chance that this will recover once the climate is right.
This article will help you with the care of these trees: https://www.gardeningknowhow.com/ornamental/trees/mimosa/chocolate-mimosa-trees.htm