Reading about your mum reminded me of a friends mother who passed away a couple of years ago. She was diagnosed with cancer, given all the treatments, told to get her affairs in order as she'd be gone in a few months.
She died 15 YEARS later...

Wonderful, stubborn lady.
When it comes to being sick like that, attitude IS everything. And from what you've said, your mum has the right attitude. That will go a long way.
Little anecdote: When my buddy was getting married, the doctors told his mother that she shouldn't be flying to Lake Tahoe for the wedding, because of her condition. Her response was, "If I listened to you, I would have dead 10 years ago. I'm going!" Gotta love that..
And yes, she went and watched her son get married..
You and mum are in my thoughts and prayers,
Cory
"When trouble is solved before it forms,who calls that clever? When there is victory without battle, who talks about bravery? - The Art Of War