Hey there Flyboy1997,
If we understand correctly, your wife would like to have an Apple Watch for Fall Detection but continue to use her non-Apple phone. If so, you'll want to refer to:
"Family Setup lets family members who don't have their own iPhone enjoy the features and benefits of an Apple Watch.
How it works
With Family Setup, your family member who doesn't have their own iPhone can use their Apple Watch to do things like make phone calls, send messages, and share their location with you.
After you set up a watch for a family member, you can use your iPhone to manage some of the watch's capabilities.
Note that some Apple Watch features depend on having a companion iPhone, and aren't available on an Apple Watch that you pair using Family Setup."
"Availability of features and apps
Health and fitness features:
- High and low heart rate notifications are available for users 13 and older.
- Heart Rate Variability (HRV) is available for users 18 and older.
- Fall Detection is available for users 18 and older.
- Users under the age of 13 can use move minutes, rather than active calories, for their Move goal in the Activity app.
Apple Pay features:
- Apple Cash Family is available to users under the age of 18, allowing them to make purchases and send and receive money in Messages with Apple Pay (United States only).
- Apple Pay using a credit or debit card in the Wallet app is not available with Family Setup.
The following features and apps are not available: Medications, respiratory rate, irregular heart rhythm notifications, ECG, AFib History, Cycle Tracking, Sleep, Wrist Temperature, Blood Oxygen, Walking Steadiness, Audiobooks, Remote, News, and Shortcuts."
However, it will also be important to review some requirements found in, Manage Fall Detection on Apple Watch:
"To call emergency services, your Apple Watch or nearby iPhone needs a cellular connection, or needs to have Wi-Fi calling turned on and Wi-Fi coverage available."
Have a good one!