Angie,
I'm so sorry about your Mother, I too have colon cancer and I too am a young Mother. My youngest daughter is 17, and it has been really hard on her especially. Cancer is hard on everyone especially the children, no child should see their Mother suffer so much. I did not have metastized lungs or liver but I do know how hard the resection was to recover from, I had a lot of support also. It does help to eat healthy and to have a good support to keep your Mother's spirits up. I too had a lot of swelling but in time it got better, if she has started chemo, this is a common side effect, also the surgery in itself causes a lot of swelling. The morphine helps and make sure she takes it around the clock, do not let the pain build up then take it, it will take longer to be effective. She will need a lot of rest, sleep heals the body. If she has a good minister and church support, they could give you healing scripture to read to her daily, it helped me a great deal. My church made me a prayer quilt, which is a quilt with yarn knots, each knot represents a prayer from a member of my church, that made me feel comforted, I used it in the hospital and for treatments, something to look into. The most important thing is you need to take care of yourself, if you need to rest, then rest, if you want to cry then cry, and talk to others you and your siblings will need support too. My girls had a therapist that came to our home for them as well as for me, it helped a lot. My uncle is going thru what your Mom is going thru with the liver and lungs, for the third time, and he is doing so well now, he is even going to Ireland in a few weeks. There is hope for us all, cancer is not always a death sentence, but it is a long and hard road to travel. I will pray for your Mom and the entire family. Keep the faith and continue doing what you are doing.
Sheryl