I am very sorry for your loss. My best friend died at age 40 last fall from the very same thing. In the same way. From the time she was admitted to her death, it was about 4 weeks. She turned 40 in the hospital.
It is a horrid way to die. Thankfully, hospice stepped in and my friend was able to spend the last week on serious pain meds. She seemed comfortable and pain-free.
Prayers to you and your family today. You have my deepest sympathy.
~T