Ghost Alarm

Hi Torresgraphics

Welcome to the Apple (user-to-user( community.

As iPhones generally work the way their settings are set,

wondering which list your wife is checking:

Eg:

Turn off alarms and delete sleep schedules in Health on iPhone – Apple Support

Else try checking out:

"Change iPhone sounds and vibrations

eg: Do you recognise the "ghost" alarm sound ...

(You can change the sounds iPhone plays when you get a call, text, voicemail, email, reminder, or other type of notification).

Change iPhone sounds and vibrations – Apple Support

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To remove a regular alarm in the Clock app,

 tap Edit at the top left,

 tap the Delete button , then tap Delete.

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Checkout reminders to see if that is the source of the unwanted alarm:

Add reminders on iPhone

Says:

"Delete a reminder

Swipe left on the reminder, then tap Delete".

Complete article: Add reminders on iPhone – Apple Support

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Change notification settings on iPhone

Eg: Says:

"To turn off notifications selectively for apps, 

go to Settings > Notifications > Siri Suggestions, then turn off any app."

Complete article: Change notification settings on iPhone – Apple Support

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How to: Turn a Focus on or off on iPhone – Apple Support

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Also:

After you turn off a Focus, it still appears in Control Center and can be reused.

Do either of the following:

✽ Touch and hold the Focus icon on the Lock Screen.

✽  Open Control Center, then tap Focus.

Then tap the Focus that’s on to turn it off (eg: tap amount of time set)

All the best :-)