A split-level house puts the bed and the bathroom on different levels with a half flight of stairs or a short run of steps and a landing between them. That changes the night route more than the bathroom fixtures do. Measure it the way she will walk it, not the way you walk it in daylight with every light on.
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Walk it first, in the dark, slowly
Pick the time of night she usually goes. Turn off the lights you would normally use, then walk the route at her pace with a flashlight held low at your hip, not up in front of your face. Stop at each step, at the landing, and at the bathroom door. Notice where your hand goes without thinking. That is where the rail has to be.
Count and check the stairs
Count the steps from bed level to bathroom level. Look for any step that is a different height from the rest, because an uneven step is the one a person misses in the dark. Measure the rise and the run on two or three steps and check that they match. The landing should be deep enough that she can stop, turn, and not step backward into empty space. Write down the count, the landing depth, and any step that does not match the others.
Check the rail she will grip
Find out which side the rail is on and whether it runs the full length of the flight, with the ends returning to a wall or a post. Grip the rail the way she would. If your hand slides around it, it may be too thick or too round to hold well. Pull hard on it at two points. If it moves, it is not solidly mounted, and it should not be counted as support. Write down the rail height at the top and at the bottom, which side it is on, and any spot where it is loose.
Light both ends
Each end of the stairs needs a light she can reach from her first step without searching the wall. A switch at the top and a switch at the bottom is the usual set. Walk the route once with the lights off to see where the dark begins. Write down where each switch is and whether it works from both ends.
Check the bathroom door
Note whether the bathroom door swings toward the landing, toward the stairs, or into the hall. A door that swings into the path of someone on the stairs is part of the route. Note also whether there is a step up or down at the threshold.
Ask before any walking aid goes on the stairs
If she uses a walker or a cane, do not decide on your own whether it goes on the stairs. Ask her physician or her physical therapist. Write down the answer and the reason they gave you.
What to write down
Keep one sheet for this route: the step count, any uneven step, the landing depth, the rail side and height at top and bottom, where the rail ends, the switch positions and which ones work from both ends, the bathroom door swing, and the answer about any walking aid. Note who did the walk and when. Walk it again after anything changes in the house or in how she walks.