The FDA has changed their recommendations regarding old people. The recognize that long term benzo use causes dementia. It used to be they would just leave people on the medicine to not agitate them. Now that they have clear evidence the medicine is CAUSING the problem, they have federally advised that high-risk older patients and those showing any signs of dementia must be discontinued off of benzos and is chasing after doctors the same way they did opioids for a period of time.
The doctors perceive the liability between the high-risk patients and the high-intensity regulators and run away ( I have seen this happen to 3 older friends, my mother is one of them. so this hits home ).
I would: 1) take stock of what medication she has left and stockpiled, and see if there is enough to taper that. 2) contact other doctors and candidly explain the situation, that you would like to proceed with an Ashton manual taper on diazepam 3) find whatever dr agrees and help her through the transition. it won't be painless, but it will be much easier to come off of. 4) follow the Ashton manual and i would say start at 5%
until then - it is wildly irresponsible of her medical professionals to try and attribute seizure activity in a bzd withdrawal patient to "probably SSRIs" sure, it could be, or it could be the onset of a seizure that might do real brain damage or kill her. They know this is one of the most active symptoms of benzo withdrawal. I have been through both bzd and SSRI withdrawal, and whereas SSRIs feel like getting hit with a 9V all over, Benzo wd feels like getting your fingers jammed in a 110v socket. forever. if she begins having symptoms of this intensity(intense shaking, hallucinations, bp over 180/100, extreme muscle contraction, prolonged brain zaps/lost time/brain resets, auditory hallucinations) - she needs hospitalization, end of story. any place worth being at will have sympathy for her situation, probably want to switch her to librium or diazepam - or at the worst fill more xanax and try and get her a good referral.
Benzos cause progressive damage to the GABA receptor system. it's part of your brains electrical axis (GABA and glutamate) and controls muscle contraction/relaxation and actual mood activation/relaxation. the receptors are all over your entire body. if you can't control this, you essentially have epilepsy. People who abuse high dose research chemical benzos over long periods sometimes destroy their seizure threshold to the point they have to take phenobarbital or a similar heavy anti-seizure medicine round the clock after getting off. It's nothing to take lightly, and your mom is a trooper for dealing with what she has without too much complaint because I would be crawling the walls and demanding justice at that point.
en.wikipedia.org
^^^ That link explains a lot. I am really so sorry they are doing this to her. I would look for a medical attorney in the area, and just ask for a consult and see if any of it merits action. they are usually willing to consult for free. sadly, it might be the case that there is only a case worth pressing if something worse ends up happening. I really hope that is not how this situation ends up.

I am really sad our doctors are doing this to our old people when their advice is what put them here in the first place.
Any doctor advising a patient on titration should have had to experience that titration themselves.