Talk. Talk talk talk talk. I am hearing a lot of "I guess" and "I think." That tells me that you guys haven't yet talked to the point where you understand each other -- you may have talked a lot, but it is the "talking past each other" version, where you are both so intent on making your points that you are not really listening to the other. So I could tell you to fix the problem with a lot of suggestions, but I don't know which one to make without knowing the real driver. Is it because she doesn't think you have enough? Numbers will fix that; do a detailed budget, compared to a detail of your current spending, and walk her through it. Is it because she is scared you won't have enough?* Then you need to understand what that fear is coming from and help her deal with it -- not by shoving your thoughts down her throat, but by showing empathy and reassuring her that her happiness and security is as important as your own, asking what she needs to feel safe, and finding a way to get her what she needs. Is it because her definition of "enough" is much higher than yours? Well, guess what: you're not "right" on this, and she's not "wrong." Read the "50 ways to convert your SO" sticky and see how you can show her that she doesn't need as much as she thinks she needs. But in the end, you are going to need to find a way to compromise with her on this** -- because, again, her happiness has to be as important to you as your own, and vice-versa. And simply telling her that you want to RE and you think you need to cut your budget to do so isn't going to persuade her that you care about her happines and so she should meet you halfway.
It sounds to me like you're the one who has recently changed your thinking on this, right? Because you don't like your job? So she is basically trundling down the path that you guys laid down however many years ago, and now you are telling her to jump off onto this completely different path, and she's disconcerted and needs time to understand what is involved with that path and what the risks are and what the upside is of taking those risks. If retirement has always been some future goal, she may need a much clearer vision of what it would mean now, on a day-to-day basis. My general recommendation for that is a bottle of wine and a relaxed evening on the patio (in good weather) or in front of the fireplace, dreaming about what you guys want to do, building that vision that you're working for. She has to feel like what she is running toward is much more compelling than what she has now -- so much so that it is worth dealing with her fears and cutting her budget to get there.
*Note that that is, in fact, a completely different cause than the first one. Logic and math can never fix fear.
**Ask me how I know. Except in my house, I'm the one in your position.