Most bathroom doors on the night route work for years without anyone looking at them. Then one day the bottom edge starts dragging on the floor, or the door swings back toward the hallway after she has pulled it open. At 3am, that small change is the one that catches a foot or stops a hand in the wrong place. The job here is to keep the door doing what it did on the day it was hung.
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Decide who owns the door
Pick one person who checks the door on a set schedule, and name a second person who can check it if the first is away. Write both names where the family already keeps its notes. A door that nobody owns is the one that drifts out of line without anyone noticing.
Walk the swing at her pace
Stand where she stands, with a flashlight, and open the door fully. Watch whether it swings all the way back against the wall or whether it creeps back into the path. Close it slowly, then let go and see whether it stays where you left it. A door that does not hold its position needs a stop, a hook, or a repair, and any stop should sit where it does not become one more thing to trip over.
Check the hinges and the screws
Look at the top and bottom hinges. Gently push the door up and down and side to side. If the door wobbles, sits lower on one side, or rubs the floor, the screws may have loosened or the hinge holes may have worn. Tighten the screws you can reach. If the holes have stripped, the fix is usually a longer screw or a carpenter's repair, not a new door, and that repair belongs on the list you hand to whoever does the work.
Check the closer, if there is one
Some doors have a spring or hydraulic closer that pulls the door shut. If it snaps the door closed, it can pinch fingers or startle her. If it is too weak, the door may not stay latched. Adjust it only as the maker's instructions describe, and if you are not sure what the screw does, stop and ask someone who knows the hardware before you turn it.
Check the latch and the strike plate
The latch should catch without a shove, and the strike plate should line up with it. If she has to push or lift the door to close it, the door has moved out of line, and the strike plate may need to be set again. If the door locks, the release from the outside is a separate check, and it belongs on the same schedule.
Write down what you found
After each check, write one line: what you looked at, what you saw, and what you did or who you told. Keep the line short. The point of the note is that the next person can see whether the door is getting worse. For a broader look at the first steps after a fall, the reading path on Start here: a reading path lays out the order.
If the door has changed and you cannot tell why, do not wait for the next trip to find out. Take the problem to the person who owns the house repairs, and keep her out of the room until it is fixed.