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I assumed maybe there was something medically wrong with her, or she had done something to not have any more children because of her vanity, although we aren't talking about a medically advanced society. Maybe Qyburn cooked something up for her.
Edit: That's right, Janny remembers Moon Tea.
I'm speculating on the Moon Tea. It would have been available to her, though, and the books set it up that women in the realm will use it to keep from becoming pregnant. Cersei herself thinks the Margaery Tyrell uses it to cover her promiscuity, during her marriage to Tommen.
I'm just saying it's a plausible explanation.