My MIL was like this, too. It made her procuring groceries and other things quite challenging because she couldn’t drive for the last ~ 3 yr of her life and we lived about a 1.5 hr drive from her house. For over a year, my H would drive to her house and spend half of the weekend driving her all over creation for her errands.
H tried talking sense into her for months and months. She refused to budge. Grocery delivery wasn’t available yet in her part of town, but you COULD place an online grocery order ahead of time and have it scheduled to pick up at a specific time slot. She’d always say that she “didn’t feel comfortable” doing that, wanted to go around the store like she always did.
Her doing her grocery shopping often took well over an hour because she would write a list and then go around the store and pick things based on the order she had it on the list ( not go up and down each row starting at 1 end of the store and ending on the other end of the store).
She also would refuse to tell H ahead of time what other places she wanted or needed to go to. So H would go there thinking it would be 2, maybe 3 hours tops of errands, only for it to be 8+ hours. And she wanted to go out to eat but insisted on my H paying every time.
That whole entire time, she’d have to go to different pharmacies every week to pick up prescription refills for a big laundry list of different medications she was on. At multiple suggestions to switch it all to a home delivery pharmacy service, she’d say, “I’m not comfortable with that.” She wanted to talk to the pharmacist each week. But why go to different pharmacies? Because this one drug is cheaper there, but this other drug is a couple of bucks cheaper elsewhere, etc.
Eventually, my H got fed up with the nonsense and put his foot down and told her that he wasn’t doing it anymore. She got a church friend to do it after that. And the church friend would come pick her up and take her all over creation 7 days a week. Like, they spent literally all day together. Yet still, MIL would call my H claiming she was so lonely. How can you be lonely when you’re around people literally all day long?
Eventually, the friend got a little tired of the grocery store nonsense and told MIL that as of X date in the future, MIL would have to do online pick-up grocery orders. Suddenly, a miracle happened and MIL figured out how to do online grocery orders.
And then eventually, the friend got sick of the “go every week to different pharmacies” game and a miracle happened again…and MIL switched all over her meds to a home delivery service.
And a 3rd miracle happened and MIL decided that she could, actually, finally do online home delivery orders of cat litter & cat food for her 2 cats.

But in the meantime, it was totally exhausting for my H. Totally understand & relate to the burn out & frustration you must feel!