She asked to keep her own bed and her own chair. Most families plan around the bed first, because the bed is the thing everyone can picture. The harder question is whether the room where she spends her waking hours holds the whole of a day, because that is where the promise actually gets tested.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
Start with the day, not the bed
Pick the one room she will live in and walk her day through it in order, on paper. She wakes, sits on the edge of the bed, gets to her chair, eats a meal, reads or watches television, takes a call, goes to the bathroom, and comes back to bed at night. Write each step as a line. Every line is a question the room has to answer. If a step needs a long walk with nothing to hold, a reach across the bed, or a second person standing in a doorway, mark it.
Check the chair zone
Her chair is where she will spend most of the day, so treat it as the center of the room. Stand where she would stand to get into it and look back at the path. Check that the chair does not block the way to the bathroom or the door, that she can reach its arm from a standing position, and that a helper could stand beside it without climbing over furniture. Ask one plain question: if she sits here for six hours, what can she see, reach, and hear?
Count the trip to the bathroom
Walk the trip she makes most, usually at night. Count the steps, note the light switch, and see whether there is a solid place to hold on along the way. You are not measuring for a remodel here. You are finding out whether the trip is short and clear enough that it stays a small thing for her. If the honest answer is that it depends on the hour or on how tired she is, bring that to the care team as a question, not a footnote.
Put everyday things where her hands already go
Gather what she uses every day: water, glasses, phone, the remote, tissues, a light she can switch on from bed. Put them in one zone she can reach without leaning out of the chair, and keep them in the same place each day. If the room has no clear surface within reach of the chair, that is a sizing problem, and it is worth solving before anything else is moved in.
Compare two rooms with the same list
If the family is choosing between two rooms, run the same day list through both. Write down what each room answers and what it does not. The room that holds the most steps without asking anyone to stretch, carry, or improvise is usually the better fit, even if it is not the largest. Bring the finished list to whoever will help you check it. The local help page lists places in St. Louis where a family can ask for that second set of eyes.