I'm so sorry Dr. Peterson won't be able to peform surgery on Ellie.
I know it is hard but try not to lose hope. I'm sure your current team of doctors can help you come up with other options. I'm sure you are driving yourself crazy waiting for Monday to get here. Try to relax (so much easier said than done) and just spend some time with your girl.
I know from experience researching medical conditions online only serves to work me up even more. Hang in there.