The biggest problem she had was that it was that the standard workflow of it capturing generated passwords became unreliable and it stopped automatically tracking the random passwords it generated. Whatever it was that she was doing, she kept losing passwords and getting locked out. It destroyed her trust.
We tried Bitwarden. It doesn't require the same leap of faith to use a random password. They're saved first before you use them. The usage flow isn't quite as smooth as LastPass was, but she hasn't lost any passwords since the switch.
She's almost forgiven me for making her use a password manager. Almost... :)