She's frustrated by people like me, who are bothered by the idea of giving unfettered access to girls so young.
"Nobody wants these young children to be having sex," she said. "But by the time they're 17, over half of adolescents are sexually active."
And most will have sex for more than a year before they talk to a doctor about birth control.
I had a list of reasons to explain my ambivalence about expanding the use of Plan B, including the tacit approval of sex at 13 that it seems to imply.
I figured it might be an easy out for teenagers too afraid to talk to their parents about sex and too passive to insist that a partner wear a condom.
I wondered whether naive young girls might rely on Plan B instead of birth control, over and over and over, with repercussions to their developing bodies.
I worried that girls would be persuaded by their boyfriends to skip the use of condoms, since there's an after-the-fact option.
It seemed that instead of empowering women, we might be putting more pressure on girls, taking away another reason in this sex-saturated culture that they've used to say no to sex.
But Wilkinson knocked down all of that, with stories and statistics.
"There's a theory that [Plan B] is a passport to have unprotected sex," she said. "But research shows that's not how women respond to it." Most — more than 60% — take it only once in their lives.
"They said the same thing about condoms," Wilkinson reminded me. Now we're grateful our daughters have them.
There's no good reason to keep Plan B out of teenage girls' hands, she said. "This medicine is incredibly safe. It's not something to be afraid of." Science tells her that.
But science also tells us that teenage brains are a work in progress, not quite developed enough to make wise choices, plan for the future, choose restraint over impulse.
That's where we come in.
"Ideally," Wilkinson said, "I like to have a conversation with all my patients about Plan A ... what they're doing daily, weekly, monthly" to make Plan B unnecessary.
Maybe if we all had more of those conversations with our children — TV off, music turned down, laptops and phones put away — we wouldn't need to have this talk about how hard we're willing to make it to keep a 13-year-old from getting pregnant.