Help my wife find her phone -- A LOT

My wife misplaces her phone about 5 times a day. Each time, she asks me to call her phone -- but when it's on vibrate, that doesn't help. I know she can use my phone to log into iCloud and use FindMy, but that's really tedious when you have to do it over and over. Is there a way to add her phone to a "friends list" or something so that when I open FindMy on my phone, I can just tell her phone to play a sound without having to go to icloud.com and make her log in?