Platys will eat newborns, but, in my experience (see my .sig), after two weeks they should be fine from her. You may be getting more, too, as platy females can store sperm for several weeks.
What size tank is your female in right now, and what other fish are in there with her?
2x20-longs, one heavily planted. Platy rancher. They. Won't. Stop. Breeding.