An install day has a start, a middle, and an end, and most of the trouble happens because someone skipped one of the three. Work through it in order. Do not let the crew set the pace of the morning.
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Before the truck arrives
Walk the route from her bed to the toilet yourself, all six stops, with the crew's paperwork in your hand. Clear every stop. Pull back the rugs, move the lamp cord, and take the stool and the laundry basket out of the hallway. Mark the spot where the work goes with painter's tape so the first hour is not spent deciding where things belong. Tell her what is about to happen and where she will sit while it does.
Before anyone arrives, write down three things: what was ordered, where it is supposed to go, and the name of the person on site who can say yes to a change. If you cannot reach the person who ordered it, that is your first problem to solve, before any drilling starts.
While the work is going on
Ask the installer to show you the placement before anything is fixed to the wall. Stand where she will stand, at the bed edge, and look at the position against the six stops. Check the height against the bed, not against the box. Check that the piece lines up with the way her hand will actually reach in the dark, not the way your hand reaches in daylight from the doorway.
Ask what is going into the wall and what it is going into. Ask the installer to say the answer out loud. A good installer can point to the framing or to the anchor rating and tell you why it is the right choice. A vague answer is a reason to stop and ask again.
Do not let the work move past a point you do not understand. You are allowed to ask the crew to put the tool down while you look.
The test before the signature
Once the piece is in, test it the way she will use it. Have her sit on the bed edge, reach for it with the hand she uses most, and stand up. Do this with the installer present if you can. Watch for any movement at the mount, any twist in the bracket, and any sound from the fasteners. If the product's own instructions describe a load test, have the installer run it exactly as written and not a version of their own.
Then walk the route. Have her stand up from the bed, go to the first stop, and keep going to the toilet with the new piece in use. Turn on the lights at the level you use at night. Daytime testing hides the problems that only show up at 3am.
What to sign and what to write down
Do not sign the completion page until the test is done and you have watched the piece work. Check that the page matches what was installed: the same location, the same model, the same number of fasteners you saw go in. If a line does not match, write the difference in the margin and ask for it to be corrected before you sign.
After the crew leaves, write down the date of the install, the name of the person who did the work, what was placed and where, the company's phone number, the warranty or service terms as printed on the page, and what you tested and how. Keep this with the quote and the signed page in one folder. That folder is what you will open the first time something loosens.
Plan a second look in a week. Walk the route again at night and check the mount with your hand. If anything has moved, call the company before the next trip, not after it.
If the work is not right
If the placement is wrong, the piece is loose, or the crew wants to finish without the test, stop and say so in plain words. Ask for the name of a supervisor and a time for them to come back. Put the request in writing, even if it is only a text message. The installer can tell you how the piece is fixed. Questions about her own health, and whether a piece suits her body, belong with her doctor or her physical therapist.
For the local lines to call and the questions to ask them, see Local help after a fall, St. Louis.