They have been at Duke all day to develop a plan of action. The MRI shows a tumor on her brain stem. You can read more about it on Jonathan's blog. In short, this is serious, the surgeries are serious, and have risks.
In the meantime, after you read, take the time to pray for Haileigh, her siblings, her parents, the doctors, and everyone else involved. I can't imagine how rocked their world must be.
Trusting in the living God who also heals.