We released the female fighter out into the tank yesterday. Figured that the babies have grown so much that they were probably safe from her. It turned out to be a reasonable assumption. Of course, she took it upon herself to chase every other fish out of her space (i.e. the whole tank). For the most part the platies ran from her, although the large male held his ground a while. Eventually she made it down to the bottom of the tank, where she discovered the corys. She stopped, tried to threaten them, but they were oblivious of her (and substantially larger than her), so she moved on to fish she could intimidate.
Twenty-four hours later she has given up on chasing the fish, but spends most of the time sprinting along the length of the tank.