Most of the trouble on the night trip is not the floor. It is the dark between the switch and the place she puts her feet. Before you buy a lamp or a sensor, walk your house the way she walks it at her real bedtime, with the lights off, and find out where the light is missing.
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Walk the six stops in the dark
Start in bed, at the edge where she sits up. Have someone who is not her stand in the bedroom doorway and say what they can see. Then mark each stop: bed edge, bedroom doorway, hallway, bathroom doorway, bathroom sink or toilet, and the way back. At each stop, ask one question: can she see the next floor surface before she puts weight on it?
Check the switches. A switch across the room means she crosses the dark floor to reach it. A switch at the bedroom door helps only if she can reach it before she is up. If the bathroom light is on the far wall, you have a gap no matter what you buy.
Compare the three ways to light a stop
You have three common choices: a lamp that stays on, a plug-in night light at floor level, and a sensor light that comes on when she moves. Compare them on what you can see from her position, not on the box. Does the lamp throw glare into her eyes when she turns from the bed? Does the floor light show the edge of the rug, or only the wall? Does the sensor come on fast enough that she is not already stepping into the dark? Does it stay on long enough for the bathroom trip, or does it shut off while she is sitting?
A bright overhead light flipped on at the door can be harder on the eyes than a low light she has already been using. Test with the level you plan to use, at the hour she usually gets up.
Write down what you set
Keep a short card in the bedroom. For each stop, write which light covers it, where the switch sits, whether it is on or off by default, and who changed it last. Write down when you tested it, so the card shows whether anyone has checked it since. When a bulb burns out, the card tells the next person which one to replace.
If furniture or cords crowd the route, fix those first. A light cannot show her a path that has something in it. The reading path lists the other stops in order.