It's true that doctors here in the US don't like to give the IUD to a women woman who hasn't given birth, but they will try it if the lady really wants to. And there are IUDs that are hormone-free.
The problem with giving the IUD is that it's harder to adapt to if you haven't given birth. For the first few months there can be cramps and pains that are worse than one's regular menstrual cramps; these and other adjustment symptoms can sometimes be excruciatingly intolerable for women who don't have the, erm, elasticity that come with a full-term pregnancy and birth.
And at $300+ before insurance, the IUD can be an expensive item to discover you can't handle. (Although in some states the public health clinics offer IUDs for a sliding scale fee.)
So she would need to look into it carefully before going the IUD route.
Some of the other suggestions here are good ones, but NOT the "early withdrawal/coitus interruptus"! It's possible for a woman to get pregnant just by rubbing genitals, with no penile insertion. She doesn't need to gamble with that.
