Advice please

Around a year ago I posted here about my mum's cervical cancer diagnosis and her refusal to have chemo and I asked what would you do if your loved one refused to have conventional treatment and instead seek out "alternative" treatment? (she did have external radiation therapy but not the internal or chemo)
Almost a year to the day from my last entry here, my Mum went into hospital with septicemia and a perforated bowel. She had surgery and a colostomy bag attached while her bowel heals but we weren't given any info regarding the cancer as the bowel was the main focus at the time. Of course, we figured that the cancer had spread but we didn't know how far or what our options were, but we assumed surgery & chemo would be offered.
Then yesterday we were told that the cancer is inoperable, that chemo isn't effective in this situation and that there is nothing else they can do. So they have admitted her into the palliative care service.
The doctor said we are looking at months.
What happens now?
What does palliative care do?
Is it wrong of my to feel angry at my mum? I can't help but feel like she squandered her one chance at survival and now I'm losing my mum and I feel so mad at her and scared for her... I would never tell her that, but it's just not fair!
Please, if anyone here has gone through something like this, please how did you get through it? I can't wrap my mind around the finality of this and I don't know what to do. I want to be there for her but I'm so scared and I have no idea what to expect, so any advice would mean so much to me right now.
Thanks.