She wasn't sterilized. An IUD isn't sterilization, it's long-term contraception. If we really wanted another kid, she could have it removed, which is relatively easy and painless (it involves pulling a string essentially). Her gynecologist suggested it after our daughter was born and she followed what her gynecologist suggested. It seems to have worked out. I don't remember why it was suggested, but it was more than just 'you won't get pregnant again.' I think something to do with regulating her period? I'd have to ask her and it's kind of a weird thing to bring up out of the blue.