How to care for an elder with late stage colon cancer?

I've been my mother's caregiver 24/7 with alzheimer's for 12 years and just found out she has advanced colon cancer and has less than two months. I took her for a cat scan to see if she had an ulcer because she's been anemic. I guess I feel pretty bad as I never had a clue. All I keep asking myself is how could she be that sick and not appear to be in pain? She doesn't talk alot, but she'll hold her head if she has a headache. I did notice she had bloating but she doesn't walk but a few steps a day so I thought it was because she wasn't moving around much and I'd give her a gas X. Is it possible she is not in pain or is she in pain and just can't tell me? Can anyone shed light on this? I can't seem to find any information on the internet. I have found something about a budwig diet and maple syrup and baking soda. I guess I'd like to try and keep her around a little longer than two months. Do these things work? Thank You