Dear Sister Marie, there is a fire similar to the one that Mishak, Shadrak, and Abednigo were placed in. God allows us to placed in ths fire. He is the One who has His hand on the temperature control. It is for our own good that He allows this trial. "All" things do work for our good because we love Him.
There is a particular book in the Bible that will help us when we are in the middle of this fire. Job suffered, not on account of his sin, but for his own good. It is a spiritual battle that we are involved in and we know who wins!
Another Biblical example that can help us is the experience of Paul. He was given a "thorne" in his side for a purpose. If Paul needed this thorne, then I do also. It keeps us dependent upon the Lord.
So, I guess what I am encouraging you with is that we can indeed glory in our tribulation for it will work for our God and God's glory. When in the fire, it is hard. We only need to look at our Saviour in the garden or on the cross and our trial is made easier. He has prepared the way for us.
I know that it hurts to see your child suffer, but even this is in God's control. Keep your eyes fixed upon the Saviour and when the testing and trials are over, you will know that God was with you.
Heavenly Father, I pray for my sister. Comfort her in the midst of her trial and her daughter also. Only you can lift her up beyond this pain. Help her to see beyond it. Give her a lesson to share with others through her poetry. Give her wisdom and grace to honor you, I pray in the precious name of Jesus, amen.