Hello @mulefan I know you are dealing with a ton of emotion right now. I have been in your shoes, sadly, enough times to be able to comment. I tend to the physical demands first, and just keep loving them every day until the end.
If your doctor is saying 6 to 12 months, that is still pretty unknown. If this were my family I would be getting into oncology as fast as possible. They would be able to give you more information.
Depending on where you live and if there are some treatments available to stabilize your moms cancer, this could regress or progress. Right now I would be trying to get a little more clarity into her condition. While there are never guarantees about timing, your moms particular cancer will determine the course.
Are you having honest conversations with your mom about this? Is she open to seeing an oncologist to get better answers and maybe even some treatment to make her body less painful?