I have lots of thoughts on this, having fought my way through this issue repeatedly as my body changed through menopause.
I usually spend a fair bit of time on my posts, and am careful with what I say. I donāt have that time right now.
(Quick aside: āexcessive amounts of B12ā is only what can be measured in serum. B12 isnāt stored in serum, so this is slightly irrelevant if her body isnāt using it well. She might need co-factorsāother pieces of that puzzle. This includes but is not limited to lithium (orotate), folate (bioavailable forms only), carnitine, potassium.)
Also note that what you donāt take is as important as what you do. If you are one of the large percentage of population for whom folic acid paradoxically blocks folate absorption, not taking FA is essential.
My guessāand this is ALL my guess; without being her, or being in her body, itās anyoneās guess-- is that she is right: itās hormonal.
The medical establishment is not good at supporting women in menopause. To put it mildly. (I deleted a rant here.) Tell her itās not her imagination if she feels medicos are discounting her symptoms.
Hereās where Iād start, if I were her advisor: vitamin D, magnesium (anything but oxide), and pregnenalone, all OTC. I do not recommend exact doses unless I have a direct connection with a person. If sheās not taking these, I highly recommend she does.
If sheās not on bioidentical HRT, I recommend she find a provider who can support that. Specifically Estridiol/E2 & progesterone. If she doesnāt want to do that for some reason, I might have further suggestions.
Without knowing more, thatās as far as Iāll go.