Yes, I've been a vegetarian since I was 8! And I was diagnosed w/ Crohn's when I was 12 (I'm 23 now). I haven't had any trouble w/ soy although my sister has a sensitivity to it... she also has Crohn's & is a vegetarian.
You can get iron from a lot of enriched foods (cereals, pasta) as well as beans, lentils, asparagus, pumpkin seeds, or molasses. I've had problems with iron deficiency anemia when my Crohn's flares, but when I'm in remission (and my body's actually absorbing the nutrients from what I eat), I have no problem getting enough iron.
Another tip is to cook with cast iron cookware b/c the iron leaches into your food. My sister lived at a house for awhile that had all cast iron skillets and pots, and she said that was the one time when she didn't struggle with anemia. So, that's an option too.
23 years old
Diagnosed at age 12
No surgeries; tried Prednisone, Immuran, CDP571, Remicade, Entocort, liquid diets, alternative therapies
Currently: Humira, supplemental nutrition