Notice the second telling
Everyone repeats a story. The signal is different when your mother tells you about the neighbor's dog for the third time in one phone call, using the same words and the same pause before the punchline, and does not seem to know she has told you. Or she asks whether you have booked the flight you booked last week, then asks again ten minutes later. One repeated question is ordinary. A pattern of repeats she cannot see is worth writing down.
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What to listen for from far away
Phone calls are a narrow window, so listen for the shape of the conversation rather than the content. Notice whether she asks the same question twice within one call. Notice whether an answer you gave earlier is gone when the topic comes up again. Notice whether she fills silence with "I think" more often than she used to, or gets flustered when a name, a time, or a sequence of steps comes up. Notice when she describes an appointment or a visit and the details do not match what the office or a neighbor told you.
Keep a simple log. After each call, write three short lines: what she asked twice, what she could not recall, and what she described that you could check. The log is not evidence for a diagnosis. It is a record you can hand the doctor, which is far more useful than a summary reconstructed from memory weeks later.
What a local set of eyes can confirm
Only someone in the house can tell you whether the repeats show up in the kitchen, on the calendar, in the stack of mail, or in the way she talks to someone at the door. Ask the person checking in to look for the same few things on each visit rather than judging the whole house. Are the same unopened envelopes sitting where they were last time? Is a note she wrote for herself still on the counter, and does it match what she told you? Does she recall who came by the day before? Write down what you see in order, so you can compare one visit to the next. If you need help finding someone nearby to do that, the local help page for a St. Louis parent is a starting point.
Tonight
Tonight, write down the last three repeated questions you remember from her calls, in the order they happened. Text the person who sees her locally and ask them to note the same few things at their next visit. Set one short call each week at the same time of day so the comparisons stay consistent. Do not ask her to take a memory test over the phone. That turns a call into an exam and usually makes the repeats harder to see.
What to leave with the doctor
Bring your log, not your worry. Write the examples in plain words: what she asked twice, what she could not recall, and what she described that did not match. Mark which observations you heard yourself and which someone else reported to you. Ask the doctor which checks come next, whether anything else could be contributing, such as a medicine, a hearing problem, poor sleep, or an illness, and what you should watch for in the meantime. Ask who to call if the pattern changes quickly. The doctor can sort out the cause, and you do not have to guess it from a phone.
Keep the pattern, not the fear
A repeated question is a reason to look, not a verdict. Keep the log going, keep the local check consistent, and keep the question list ready for the next appointment. If you want to see how this desk checks its own claims before anything is published, the How We Write page explains the process.