Everyone can understand the devastion you are feeling. Let those tears flow.
Your daughter is in shock and is doing all those practical things she must do to ensure things are in order.
No there isn't a cure but metastatic disease can be managed for years for many. My sister lived to see her children have babies. She got to spend time with them. It's ok to have hope.
As to anger, guilt and all those emotions. Yep...it will happen but soon you need to just let it go and focus on what is in your control. Put your energy in that.
Be there when she needs.
Help her plan what she needs to, however painful that is.
Treatment is tough, you know this and have rare inside knowledge.
Treasure every moment you can, and we all have hope that there will be many more special moments to come for all of you. X