Start at the bed, not the wall. At night you will walk the route with the lights low, one hand on the wall or the frame, and a cord on the floor is what catches a foot. A cord channel is a low run that holds cords against the baseboard and off the floor. It does not change where the cords go. It changes where they lie.
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Walk the route first and list the cords
Walk the route from bed to toilet at the hour she actually makes the trip, with only the lights she normally uses. Write down every cord that crosses or touches the path: the lamp, the sensor pad if you have one, the phone charger on the nightstand, the plug-in night light, and any extension lead. Note which outlet each one uses. A cord that crosses the walking line needs to be moved, not channeled, so mark those separately.
Decide what the channel can and cannot fix
A channel is for cords that run along a wall. It is not a fix for a cord that has to cross the floor to reach an outlet. If the only outlet sits so that the lamp cord must cross the path, the fix is to move the lamp or the outlet. Moving an outlet is electrical work for a licensed electrician, not a weekend job. Ask about it before you buy any channel. Local names and numbers are on the local help page.
Buy for the bundle, not the single cord
Measure the bundle at its thickest point, not one cord. Count the plugs too. Bulky plug bodies, especially on chargers and transformers, will not sit inside a narrow channel, and forcing them in lifts the cover. Pick a width where the cords and their plug bodies sit inside with room to spare and the cover still snaps down flat. Check whether the finish can be painted if you want it to match the wall. Buy one more length than the measured run so a bad cut does not stop the job.
Mark the run and dry-fit it
Run the channel from the outlet to the lamp or sensor base along the wall, staying off the walking line. Mark the path with a chalk line or painter's tape. Lay the base sections on the line before you fix anything, and check the corners. Cut square, smooth the cut edges, and dry-fit each corner piece. A channel that does not sit flat at a corner will lift there first, and that lifted corner becomes the new trip.
Fix the base and test it with a pull
If the base screws into the wall, find a stud or use anchors that suit the wall type, and drive the screws until the base sits flat without cracking the wall. If the base uses adhesive, clean the wall of dust and grease first, because adhesive on a dusty wall lets go later. Follow the maker's instructions for cure time and keep feet off the section until the adhesive is set. Once it is fixed, give each section a firm pull by hand. If a section moves, fix it before you go on.
Route the cords inside, then snap the cover
Lay each cord inside the base with a little slack at the plug end, so the lamp can move without pulling the cord out. Do not pinch a cord under the cover, do not run a cord under a rug or runner, and do not chain one power strip into another. If a plug body will not fit inside, leave the plug at the outlet and shorten the run instead. Then snap the cover down, starting at one end and working along, and press each joint flat.
Walk it in the dark, then check for warm plugs
Walk the route in the dark with the hand she normally uses on the wall. Your foot should find only floor. Test the lamp switch from the bed, the way she will reach it. Then, after the lamp has been on for an hour, touch each plug and outlet cover. A warm plug, a buzz, or a smell of hot plastic means stop using that outlet and call an electrician. Do not wait for the next visit.
Write down what changed
Write one line for each cord: which outlet, which channel run, and where it now sits. Write the install day on the same line, next to the cord it covers. Name the one person who checks the channel each month. That check is short: walk the route, press each joint, look at the plugs. Put the line where the next person looking will see it, on the route log. If the channel lifts, a cord comes loose, or a plug runs warm, write that down the same day and call the person who owns the fix. Any fall on this route still goes to her physician, even if the cords were not the cause.