The Pulmicort is by mask in a nebulizer, right? She'll probably get a LOT more steroid that way. Just make sure that you wipe her face after each Pulmicort treatment -- it's notorious for causing thrush (and for little kids, the thrush appears on the face as well when the mask is used).
Hope no one minds that I'm answering this, but I might as well. M470V polymorphisms are found through cystic fibrosis genetic testing. From what I understand, they are almost like CF mutations, but it's not proven that the polymorphisms cause CF...they can cause CF-like symptoms, however. It's been found that some people with asthma can either have CF polymorphisms or carry a CF gene.
You said you're from Pittsburgh? Is there a children's hospital there? If not, in Phila******a (not sure how close that is to you [not sure why it's being censored either]) there is a children's hospital with an excellent group of pulmonologists who specialize in pulmonary disorder s, particularly asthma and CF.