Could you talk your family doctor into ordering a comprehensive blood test for your mother, asking if she/he will let you indicate what you want to test your mother for? If you have a cooperative doctor who is willing to take the odd request from a respectful patient it may be as simple as that - the insurance justification might simply be "peace of mind" (I've had this once for something else).
I'm a bit shy to ask my own doctor now (as I have no symptoms) and commercially available tests here in the Netherlands look a lot more limited in scope (focused on anonymous STD detection etc). I'll follow this thread. I hope for your mother that you can sort it with doctors already "on the case" - or have they already rejected this?
E4/E4. 45 years old, no family history (mother E4/E4 and symptom free at 73, father E4/E3 and symptom free at 87). Recently started 16h fasts, taking resveratrol/B12/curcumin/krill oil/folic acid. Working on minimizing sugar & refined carbs