At 3am your mother is not thinking about the bedroom door. She is thinking about the bathroom. That is why the door is easy to miss. It sits at the start of the trip, and it can add an unplanned step or a reach right when she has the least room for one.
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Stand where she stands
Do this walk at night, or in the same light she uses at night. Stand where her feet land when she gets up, then open the bedroom door the way it is hung now. Note which direction it swings. If it opens toward the bed, she has to step back to let it clear. If it opens into the hall, it may land across the path she needs, and a stop, hook, or latch on that side is one more place her hand has to find.
Check the arc, not just the door
Look at where the door ends when it is fully open. Does it stop against the wall, a dresser, a laundry basket, or the corner where she turns? Measure from the door edge to the nearest object at hip height and again at hand height. A door that clears the floor but hits furniture at hand height is still a problem when she is holding on to something.
Then check the closed position. Can she open the door with one hand while already walking? Does the handle sit where her hand goes after she leaves the bed, or does she have to reach across her body? If the latch needs a two-handed pull or a turn she cannot make while steady, write that down.
Compare three honest answers
There are usually three options, and you should compare them rather than guess. First, leave the door open at night and clear the arc. Ask whether the open door creates a different problem, such as light from the hall, a pet passing through, or a draft, and whether the path stays clean. Second, keep the door closed and make the opening easier, such as a lever handle in place of a knob or a clear spot on the hall side for her hand. Third, change the swing only if the hinges already allow it and someone qualified confirms the change is safe. Do not pick the cheapest option until you have walked the trip with the door in each position.
Write down what you found
Note the swing direction, the fully open position, the object the door stops on, the hand height where it meets her path, and whether the latch works with one hand. Record each position you tried and which one she used without help. Keep the note where the next person who helps her at night will find it, so the door does not quietly go back to the way it was hung.
If you want the order of the whole night route before you start on one piece of it, begin with start here: a reading path.