Yes, I agree with Camille, that the Adana is a good choice, but I also love my “little black iron beast”, a Kelsey 5×8. I got it used for $300, and it didn’t take long to clean up and get into good working shape. I cleaned it up, oiled it, and got new rollers, and it works beautifully.
But before you buy her a press, you might want to buy her a letterpress printing class – look around for print shops nearby where she can learn the process, and maybe even rent time on a press. Once she gets a little experience with printing, she (and you) will know better what to buy and and what to look for when buying a press.