Hi kitkat6478, I'm new on here too and also living with Mum (or rather Mum's stuck here with us throughout treatment)..
Cancer is hard for everyone involved, no one would deny that.. But Man.. , When It's in your life you realize it's harder than you could ever imagine.. It's just so ? constant!!!
I was about to say "try talking to her".. But that's a dumb thing to say, If you could, you would have already.. My Mum won't snap out of anything unless I've become a heaving blob of desperation tears, and even then there's a new obstacle within a matter of days.
I dunno? I think she's given up, she's certainly not living..
All I can say is keep up the good fight for your mum, she can't, and she'll see you, appreciate you, even if not right away, she will in time..
Sorry about my comer addiction, I breathe a lot..