Mitchell,
I want to skip to the bottom of your intro, should you prepare for the worst. Honestly, NO!!! Not at all!! I have had discussions where I have frankly told people to brace for the worst because of this disease(right here at work as a matter of fact) so I pull NO punches. So Trust me when I say I am not just being a cheerleader, your Mom should have great hope for survival. This is NOT brace for the worst time.
I'm glad to hear there will be some follow up with the onc to do some chemo to head any possibility of spread off at the pass.
It's nice to hear of your tight relationship with Mom. My mother was by far MY rock. I did, according to her, flip roles with her after diagnosis. There has been no greater honor in my life than being that for her.
I know you are pissed off and upset at this turn of events, but stay positive, there is a lot of reason to be.
God bless, my friend. Be positive.