Looking for a device to keep Mom sitting in her wheelchair. Any suggestions?

Thank you all so much for the advise.

When Mom started to have falls out of her wheelchair, they refitted her with a smaller/narrower one (she’s very tiny) and also provided a solid pad that’s the shape of a large L which slides down the inside of the chair like a big armrest right up to her shoulder. This helps her position properly side to side and keeps her propped up better.

They are not allowed to restrain but under the circumstances I wonder if one of those belts they use on a paraplegic that is paralized from the neck down would work. Just found this site

www.alimed.com/geriatric-chairs-and-accessories/?cp=2&ppp=20&sort=title

There's a trunk support. I would check with Medicare, supplemental or Medicaid and see if they cover something like this.

Once they can no longer hold themselves upright they shouldn't be using a simple, basic chair. Ask how to get her fitted for a chair with supports (it will take an OT), there are many makes and models. Early on I opted to get my mom a tilt in place chair with custom cushions and headrest because I anticipated that was eventually where she would be spending all the time she wasn't in bed, the only thing I had to change was to upgrade to a ROHO cushion. It definitely wasn't cheap, but some of the cost could be covered - sorry I'm not knowledgeable enough in that department to point you in the right direction.