Are the fry surviving? It could be the mother aborted early from the shock of what you have done.
Doing a 100% cleanout is not good. Did this include the filter? If so, your tank is going to have to cycle again so it might be better if the mum and other fish eat the fry as you will trouble keeping any of the fish alive for a while now, let alone the fry.
Just put the fry in the breeding net but don't be surprised if the angel sucks them out through the mesh.
Keep testing daily for ammonia, nitrites and nitrates so you know how the cycle is going. You will need to do daily water changes too if you cleaned out the filter as well.