Palin supporters are going to start jumping off the roof soon, when they finally realize she isn't going to run.
She can't run now. This thing is a giant mess and she's right in the middle of it. It doesn't matter about O'Donnell and she had been disinvited but Palin had made a commitment and now she's broken it.
People have made an economic investment in this. Palin cannot do this without looking like a prima dona.