Nobody reports this kind of change. No alarm sounds when a neighbor stops stopping by, and no bill arrives for a friend who quit calling. You notice because you keep a mental list of who came, who rang, and who she mentioned, and one day the list is shorter. If you are the daughter, you may be the only person who knows the list existed.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
Before you decide what the gap means, find out whether she is the one pulling back or whether the way to her has narrowed. From the outside those two situations look the same, and they need completely different responses. A woman who wants quiet is not the same as a woman who cannot get down the front steps, cannot hear a voice on the phone, or is embarrassed to be seen on a bad day.
What the house may be doing
Start with the route a visitor takes. Walk it yourself, as if you were the friend. Is there a step at the door with no rail? Can the bell be reached from the car? Does the visitor have to find a key, wait at a locked door, or climb to the room where she receives people? A visit that takes effort every time is a visit that quietly stops being made.
Check the phone as well. If calls used to run long and now end quickly, ask whether she can hear clearly through the handset, whether the volume is set where she left it, and whether she can find the numbers she wants to dial. Someone who cannot easily reach people will eventually stop trying.
Check the timing too. If friends used to come when she was dressed, fed, and rested, and now the day has slipped, she may simply be avoiding company when she is not at her best. That is worth knowing, because a schedule can be adjusted in a way a fading person cannot.
What she may be telling you
Some withdrawal is hers to choose, and it deserves respect. Many people want fewer, quieter visits as they age, and a house that holds that preference is doing its job. Your task is not to force a full social calendar back into her week.
The question is whether the choice is still hers. Ask her plainly, when no one else is in the room: who she misses, who she has stopped expecting, and whether anyone has said something that made her stop picking up. Listen for shame. Someone who hides a fall, a stammer, or a hard afternoon from her friends will often say 'I'm just tired' when the truer answer is 'I don't want them to see me like this.' Those are different problems and need different help.
When it becomes a question for the care team
Bring the care team in when the thinning comes with other changes. If she is eating less, sleeping at odd hours, losing interest in things she used to enjoy, seeming more confused, or becoming unusually fearful or flat over several weeks, do not wait for the next routine visit. Tell her doctor what you have seen, in plain words and in order: what used to happen, what stopped, and when you first noticed. You are not diagnosing anything by noticing. You are giving the people who can examine her the outline they need.
Also bring it up when a barrier you found is one you cannot fix yourself, such as a step that needs a ramp, a hearing problem that needs a proper test, or transport she can no longer manage. Those are questions for her doctor and for the local help we point families toward in Local help for keeping her home.
What to keep track of
For four weeks, keep a simple written list. Note the day each visit or call happens, who it was, how long it lasted, and whether she seemed glad, flat, or anxious afterward. Note anything she says about who is coming or not. Patterns that look like nothing on a single day often become clear on paper. Hand the list to her doctor or the care team. It will tell them more than your memory will at 2am.
If a hired helper is in the home, ask them to note who arrives, who calls, and how she seems after a visit. They can report what they see. Do not ask them to judge her mood or to take on her social calendar beyond the tasks you have agreed on.
Staying in her own house is a promise about her life, not only about her walls. Keeping the people in her week is part of that promise, and it is worth noticing the first time the list gets shorter.