I would highly recommend that your Mom have her B12 tested for. Her symptoms, along with the fatigue, are suggestive of a deficiency.

Also, as we age, our stomach ages. We lose stomach acid. Some people need Betaine HCL to help digest their food (me included).

She may want to be tested for celiac disease as well.

Methylcobalamin, as many here will tell you, is the best B12 supplementation. Both B12 and D deficiencies are common. I had a severe B12 deficiency. Other members of my family had deficiencies as well, with numbers in the 400s.

Please have her tested soon. This condition is reversible if treatment begins soon enough.

Annie