My wife had a long history of anemia, which really bothered her since she's got AB- blood that has another factor that makes it the rarest blood type to donate and much needed for neo-natal issues. She cried for several days once because her iron was too low to donate blood to a sick baby that soon died.
When she stopped eating wheat and gluten, the anemia stopped. Her iron count is perfect.
What you eat has everything to do with your health.
Celiac Disease is associated with anemia. Has she been tested? That is the one diagnosis whereby a person should avoid gluten.