My iguana is way too picky!!!?

I know that iguana's should get 80% greens 10%veggies and 10%fruits, when she was new she happily ate carrots, asparagus and green beans, I didnt have greens yet, but now it's been a week since she ate veggies she always eats only the greens, I try mixing it but she always ends up only eating really small veggies, and most of the beggies are very healthy, Is there no problem with this? she only eats mustard greens and our local greens (I dont have other types)