It's not your typical work-related injury, but these things do happen... especially when someone is intentionally thrusting their foot into your vagina. It could've been worse - a flesh wound via jagged toenail... that would've put her out of work for good.
She hits up the doctor cause she's having difficulty getting pregnant. I'm no gynecologist but if shaved that bush her husband would probably have an easier time finding the right hole.
His girlfriend doesn't sound too happy about his poor performance between her legs. They have anesthetic creams that work wonders for premature ejaculation. I'd say buy some.