GaRebelRunner, there are lots of good multi-vitamins on the market, and these should boost her iron a little. She can also talk to her doctor.
As meri said, we don't really have more incidence of low iron than omnivores. As a female, things like the time of the month she tried to donate can play in. Also, she can add more iron-rich foods into her diet, and avoid things like caffeine that inhibit iron absorption.