If I were you, I'd find something to occupy my time to get my mind off this for a while. There is not one thing you're gonna learn by searching the internet about your mom's staging or her likelihood of survival - you just don't have enough information from the doctors yet.
And even after you do learn her stage, that will provide you no information about her chance of survival. She's an individual and cancer and its treatment are different for everyone.
I've heard of plenty stage iv folks with initial CEA numbers in the hundreds and some in the thousands that got to NED status.
If the information you receive from her doctors does not include a plan to get your mom to NED, the best thing you can do is get a second, third, or fourth opinion from a major cancer center.
Colonoscopy 2/17, 5cm tumor descending
Diagnosed stage iv, liver mets 3/17
Colon resection 3/17
Told surgery not an option, get my affairs in order
Meet w/MSK team 5/01/17
Liver resection/implant HAI pump 7/17
HAI pump chemo(5rds) 8/17-2/18
Spot on chest CT 10/17
Lung biopsy (that was fun) 11/17
Nocardia bacterial infection w/spread to brain (this is serious) 11/17
IV antibiotics 12/17-2/18
Oral antibiotics 3/18-present
Clear of cancer since surgery