If I could get away with not having a cellphone, I would honestly much prefer to not have one. Unfortunately, the modern job market and my wife wanting to be able to reach me make it unlikely that I could do so without suffering some fairly major issues.
Initially, I quite liked the idea of being able to consolidate multiple devices, like an e-reader and music player into a single device, but I’ve really come to resent the expectation that I should always be available to contact at all times.
If I could ditch mine, I’d really rather just have some sort of portable device in a similar form-factor that could play connect to WiFi, play music and podcasts and work as an e-reader. Bonus points for some sort of offline map/navigational capacity. I don’t want to get texts or phone calls, and only be able to access email and the broader internet when I’m somewhere with WiFi.
I like to think I’ll eventually get to a point where I can do that without having to worry about being unable to get jobs for not responding quick enough. Unfortunately, it seems like more and more things are trying to make cell phones an unavoidable aspect of participating in society, whether it’s banks only offering OTP texts for 2FA, or so many venues no longer even offering the option to print your tickets at home, but instead requiring you to display your ticket in an app on a device with an active data connection.
Go to another account she hasn’t messed up on her phone, and make her watch as you use the password manager to get in. Then, you can tell her for sure that the tech is working, and you’ve done your part, but you cannot fix her behavior. If she wants to keep resetting her passwords all the time, that’s on her, otherwise, she’ll have to put a small amount of time and effort into adapting to using the password manager.
If she isn’t going to follow your suggestions and advice, why is she asking you for help? If she sincerely wants help, she needs to make an effort on her side to follow through.
This is a problem with psychology and boundaries, not a tech issue.