A doorway can look wide enough from across the room and still stop her chair, her walker, or her turn. The number that matters is the clear opening she passes through, not the size printed on the door.
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Measure the opening, not the door
Measure from the face of the door stop on one side to the face of the door stop on the other, at the narrowest point, with the door open fully. Note where that narrowest point sits. A trim strip, a closet frame, or a door handle can take off more width than you expect, so measure the gap as it is today, not as it was built.
Walk the whole route, room to room
Start at the bed and end at the place she most wants to reach, usually her chair by the window, the kitchen table, or the front door. Write down every door, hallway, and corner along the way. A hallway that is wide enough straight on may be too narrow at a corner where a walker has to turn. Stand where she would stand and count the steps a helper would need to walk beside her.
Check the swing and the threshold
Note which way each door swings. A door that opens into the path can take up the space she needs to turn, and a door that swings toward her chair may need to be propped or removed. Look for a raised threshold or the edge of a rug at each doorway. Either can catch a wheel or a foot and change the whole route.
Compare against the device, not a guess
Once you have the numbers, read the width and turning requirements on the paper that came with the walker, chair, or other equipment you are considering. Set her measured route beside those numbers. If the opening is short, ask the equipment provider whether a narrower model exists or whether the route should change instead. Do not assume a wider opening is the only fix, because a different device can sometimes solve the same problem.
Write the route on paper
Keep a simple sketch with the measured widths, the room names, and the direction each door swings. Store it with the house papers. When new equipment arrives, or a helper asks where the chair will fit, you will not have to remeasure at the door.