Sorry about your friend but it sounds like she went out kicking and screaming so good for her.
She fought the good fight for more than 5 years.
I lost my mother in law to a long term debilitating illness that took 18 months to kill her. It was a soul destroying horrible experience for everyone involved. I can’t imagine having to live through this 4 times longer. I’d lose my mind if I had to be a caregiver for that. And I’d off myself if I was the patient. Sorry, but I can not accept the BS that suicide is any kind of sin in that circumstance. Any God worthy of my respect and worship would understand.