Found a workaround for the flows that are not responding. Not a solution however…
If you add a virtual device in homey that starts the flow, your wife can switch the virtual device to start the flow.
Best is to set it to start the flow on switch ON and to start the flow on swich OFF. Otherwise your wife has the set the switch back to off everytime.
Still can’t figure out why Google assistant can’t start the flows from a family members account.
Have the same set up here with a homey account for my wife and she can start flows from her Google account without problems.
What kind of account does your wife have in homey? user or admin?
Perhaps the following discussion can show some more light on the problems discussed here.
Homey end of speech and Google integration