I agree with you on being a team.
In my thinking, if she wants to earn an income then support her on that.
Any income that she earns goes into the communal pot that you then meet your financial goals and she can take some for her separate bank account for personal security. Of course, you do the same, just to keep the marriage on par so nobody has an undue advantage here.
Sometimes, as a team, you have to give a little bit. Since her concern is being financially insecure, let her be financially secure by having that individual bank account. The amount means nothing in the overall picture, because it would be an asset that gets counted in the divorce and it makes her feel better to have it. It removes a fear about the marriage for her.
It's also a way to show her that you're willing to protect her about her worst fears about being abandoned at her most vulnerable point in life, just like her mom.