I'm so sorry to hear that. As a patient with IBD, you really have to advocate for yourself. In your circumstance, you really have to learn to be the advocate for your child.
Call your insurance and ask to get an expedited review. If they are unable to do that, call your doctors office and ask them to call in for an expedited review. Typically, whenever I am starting a new medication, I ask my doctors to send it in "expedited". There seems to be a process they are able to do such that once prior authorization/review process begins, if it is submitted as "expedited" or "urgent" the insurance company must respond in like 24 to 48 hours. I assume it varies state to state though.
Once it gets approved, I would suggest that you stay on the ball with specialty pharmacy in order to get the ball rolling.