Here is the "sticky thread" I previously mentioned:viewtopic.php?f=1&t=53238
Scroll down until you find the Stand of Care link from NCCN. It's a good place to start for beginners & also contains a list of questions to ask the doc.
Also our "Sticky thread" of terminology & abbreviations may be useful:viewtopic.php?f=1&t=5366
At the top right of the board here is a link for Michael's Mission which also has resource information.
Your mother's age w/b a consideration for the oncologist to determine course of treatment depending on any underlying medical conditions she may have, overall health & living situation. Dose adjustments can be made in chemotherapy while remaining effective if she chooses to go that route.
In the U.S. FOLFOX tends to be the first line of treatment, depending on repsonse, FOLFIRI 2nd line treatment whereas in some other countries it is the reverse.
I would caution if your mom chooses chemotherapy all throw rugs should be removed in the house (trip hazard chemo or not). Chemo has a lot of side effects, particularly Oxaliplatin (peripheral neuropathy).
Spend some time on here reading, using the search box. You'll learn a lot from patients & caregivers alike. Get a notebook; keep all records in it, bloodwork, scans, reports, etc.
I would really encourage you to carefully review the NCCN standard of care guideline link provided above in prep for consult w/the oncologist & really listen to what he/she says to absorb it all. If you reside in the U.S. you will want to brush up on what Medicare will pay for as far as bloodwork, tumor testing, CT scans & PET scans. I would want tumor testing, CEA baseline through bloodwork (though not a reliable baseline marker for some individuals), a PET scan (tho I believe Medicare limits those) AND read, read, read here on this site. Use that search box.