Assisted living is VERY expensive, but a good way to spend down your money to get onto medicaid. However, they are VERY selective about who gets accepted, and if your mother is incapable of caring for herself, you may have to look at a long term care facility.
They vary from place to place. Most are self sufficient apartments, with small kitchens,
There is usually a mealsite, (meals prepared by others) and it is generally an added cost. You can also have an aid for an extra cost for general personal care such as showering. Laundry is also often an added expense,
You described your mother as slowly losing her faculties. Has she seen a dr, for the dementia she is exhibiting? An adult day health program is excellent for people with Alzheimers and other dementias, it keeps their health in check and provides them with socialization and stimulation to aid their brain in fighting the progression.
Also call your local department on aging or Council on aging, or senior center, they can help you with locating adaptive equipment such as large button phones, big remotes, lifeline, etc.