What does it mean to be rendered sterile?

Answer 1

To "be rendered sterile" usually refers to a procedure that leaves a person or animal physically incapable of sexually reproducing. For instance, animal shelters often spay (females) and neuter (male) dogs and cats before they release them to new owners. These procedures render the animals sterile so that they cannot reproduce and contribute to animal over population.

Answer 2

That that woman can't have kids naturally.