Well, she can still open carry I would think.
And in the law it says “unlawful user or addicted to”.
Seems that she IS a lawful user (in Washington State). If she can show that she is not addicted, then perhaps she can get it looked at again. Something like: “I CAN use Advil for the pain, but it also causes problems like x,y, and z; whereas the pot doesn’t.”
Even if she is not "addicted" (no one is actually addicted to MJ), she is still an unlawful user according to the fed. DENIED!