Hello!!!
- The first step you could try is to head over to the "Home" App on your fiancé’s phone
- click on the "arrow" at the top left side on the app
- if you look at the "People" section you will see her icon click on it
- now you will see a section called "Siri on HomePod" with a "Personal Request" toggle button, turn it on and on then try sending a text.
If this dose not work try unplugging the HomePod and turn off the phone wait 30 seconds then plug the HomePod back in and turn on the phone and see if this works now.
(If this dose not work try using Siri on the phone to see if its a issue on the phones end.)
If all else is not working maybe try resetting the HomePod might be needed.
- On your iOS device, open the Home app.
- In the Home or Rooms tab, press and hold HomePod, then tap Details.
- Scroll to the bottom and tap Remove Accessory.