I'm looking back on the past month and a half, and remembering SO many prayers I prayed, asking God to do just this. Asking him that it not be life threatening, then asking that she not need brain surgery, and even daring to ask that he remove the lesion completely. And, although I asked and believed that he could do all of these things, I am still in a bit of shock that he did. I know that there may be medical explanations for what happened, or there may not be. We will never know exactly what happened. But, medical explanation or not, God healed my sister, and I am thankful.
Thank you again for your prayers. Please remember to thank and praise God for this amazing answer!!!