Very sorry to read this, starkers. 
Only thing I can think of is telling you about some of the things I experienced.
I quote my reply from Xiandi Needs Our Help thread:
My mother had cancer. She had surgery, but I also think an alkaline diet helped her. No meat, alcohol, dairy, (sugar), (grains). I try to eat "alkaline" myself just because it makes me feel better.
Let me give you the full story.
When I wrote this my mother had already died. I left that part out because it had nothing to do with cancer. After having surgery my mom went back for different tests. Doctors told her everything looked fine and there was no indication of cancer. She had been lucky and the surgeon told her so, because she could have had multiple tumors and more organs affected.
I thought of this cancer as a blessing in disguise. I was worried for my mom for several years. She drank too much wine (everyday) and it seemed to affect her brain. This might not end well I thought.
Cancer changed everything. She stopped drinking wine and started eating alkaline. She and my dad put a lot of effort into their new lifestyle.
Doctors told her she was free from cancer. I looked at her and in my mind I just knew that she didn't have to worry about cancer.
My only worry was that she couldn't let go of the “cancer ghost”. My parents were planning a trip to Germany to a holistic cancer clinic, not because she had cancer, but more like prevention.
I thought this was unnecessary. But if they want to go to this clinic then why not. Just don't overdo it because you are already healthy, I thought.
My mother liked to swim in the sea and one day before going to Germany, she drowned while swimming. She was alone, but other people saw her and she was taken to the hospital. Unfortunately she had been in the water too long and she had severe brain damage.
My father and I decided to take her off life support after four days. She was asleep those four days, because if they took away the sleep medication she would get cramps and pain. There was no way to contact her. I am actually thankful her condition was that bad, because it made our decision easier. We were present one time they tried to awaken her, but I knew it was over.
This might seem like a tragic story and it is.
I take inspiration from the way she changed her lifestyle, eating habits and drinking habits and overcame cancer.
Sometimes surgery is needed, but I think the body can heal itself just by staying alkaline. The blood will always stay within a narrow pH-range but many other organs can become too acidic and then infections, tumors and other problems can arise. The pH-scale is not linear so even a tiny change in pH-level is a huge change.
Don't be afraid of the “cancer ghost”. Yes, it's serious, but people overcome cancer, even stage 4 cancer. It's not a sprint, it's a marathon. Doctors can give emergency help, but building a healthy body is a lifelong process.
There is too much profit (incredible profit) in promoting things like chemotherapy and too little profit in promoting healthy food. My mother was offered chemotherapy after surgery (to be on the safe side as they say). There was no real reason because her tests were good.
I am not in favor of chemotherapy because of side effects, but if my mother had said yes to chemo she wouldn't be able to swim which was what killed her. Life is crazy, but because I believe in God and that each person has a soul connected to God, I don't believe in random events.
Your daughter is young and should be able to recover. Take one day at a time. I hope and pray God will give you all the guidance you need in this situation. You can get through this together. 
