Mom talks over people and talks to herself, with short term memory loss. Any ideas?

Is there a known condition in someone with memory loss who's hard to reach with vital info due to excessive talking? On the worst days I can't get a word in edgewise with my 80 y/o mom, increasingly since about 2015. Dad died in 2014 but her traits were forming earlier.

On bad days it becomes a serious practical problem when I'm trying to help long distance with computer (screen-sharing) or getting her to send details to research appliance parts, etc. Even the simplest thing is an emotional ordeal for her on those days. Usually, on any day when I call, she immediately starts talking as if she made the call, forcing me to bring her attention to my reason for calling. In person, she'll keep talking for 5-10 minutes after I leave a room, seemingly not caring if it's heard or knowing where I am. That self-talking occurred as long ago as 2013 but her general inability to listen has worsened.

She also has manic/panic episodes when she needs the most help (usually out of tech frustration) but is the least reachable with logic. Sometimes she just hangs up the phone and accuses me of "hammering" her when I constantly have to raise my voice to get attention. Technical tasks are increasingly difficult due to memory loss, since learning means memorizing, not rote steps. I get a lot solved but I wish it didn't take so much effort. She's obsessed with (often cosmetic) yard & home projects on a good-sized property but won't lighten her load to reduce stress.

She has very little patience and won't even spend a minute learning how to do a PC step that keeps stymieing her (like finally learning when you need to right-click vs. left-click). It's not about lack of time since she'll watch political analysts or movies for hours. She's in a constant state of resistance to technology but expects me to have endless patience with the same issues. And she entirely forgets many notes & emails I've created to help her. They'll work for a week, then it's Groundhog Day again.

My sister (too far away to normally help) is in partial denial due to mom's "showtiming" when she does visit. She's also the type who's "too busy" to do anything that isn't planned out days in advance, and I suspect it's a ruse. She shares my mom's unwillingness to get to the point about what's really going on.

One of mom's late sisters was bipolar with crass talkativeness, and another sister (I've barely met) has something similar but mom won't admit to any of it in herself. She tends to treat everything as someone else's fault, but shows painful insight into her own frailties at times (usually w/panic attacks). You can't have sincere two-ways talks with her, even on up days.

I'm leaving out details but this may be enough to go on. Thanks for any medical insights.