Some people who fall on the night trip never called out at all. They got up in the dark, went to the bathroom, and came back, or did not come back, before anyone in the house knew. The problem is often not that the alarm failed. The problem is that the trip was never announced. Here is how to tell it is happening, and what to do with what you see.
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Why a quiet trip happens
She may not want to wake you. She may think she can manage the route because she has done it many times. She may have turned off the bed alarm because it went off for small movements, or she may have left the pendant on the nightstand. Each reason is ordinary, and each one leaves the same gap: the trip happens and nobody is told.
What to look for in the morning
Check what the night leaves behind. A hall or bathroom light left on. A bath mat moved, bunched, or wet. Bedding pulled back on the side she gets up from. A phone that was not on the charger, or was on the charger but out of reach. A bed alarm or pendant that is off, unplugged, or not where she wears it. A new bruise she cannot explain. Note each one. A single sign is a question. Several signs in a row are a pattern.
Ask her, without making it a test
Ask a plain question at breakfast: did you get up in the night, and what did you need. Do not frame it as catching her. If she says she did not want to wake you, that tells you the call is not becoming a habit yet. Write down what she says, in her words.
Change the call, not the blame
Make calling out easier. Keep the phone, the pendant, or the light switch where her hand lands in the dark without searching for it. Ask her what would make her call, and write her answer down. If she says she does not want to bother you, the change may be a shorter call routine, a sound device by the bed, or a set time for a check. Choose one change and watch whether the signs stop.
When the pattern is about the body
If the trips are frequent, if she is getting up many times a night, or if she seems unsteady when she stands, that belongs with her physician. Take the morning list with you. The physician decides what is behind the trips. Your job is to keep the record that makes the question easier to answer.
What to write down
Keep a simple log for two weeks: the morning sign you saw, the item out of place, and anything she said. Bring it to her physician with the rest of your paper. Keep the route clear and the call within reach, and keep writing it down until the signs stop.