I'm a latecomer to MMM and I agree that you have to "Show, don't tell." While it's good for you to crunch numbers and do some internal planning, the better way forward right now is to start living the principles of what you're pursuing. Once your wife sees benefits, she might become convinced to join in, but either way, your lives become better.
I got here in my 50s, so for me, ordinary early retirement (60ish) and not FIRE is the goal. My wife is 12 years younger and is actually just starting her "real career," so to her, retirement is not even desirable, since she loves it. However, I've been an advocate of frugality and low-cost investing. We paid off her student loans and house, and then we each started investment accounts. After she saw it piling up, she became more interested, even to the point of giving up or delaying things she wants that I resist in favor of more savings (house renovations, mostly.) Still, we have been self-employed and work at our own schedules for the last eight years so I consider us "independent" if not necessarily FI.
A week ago, she calculated and printed out a yearly schedule for us to get to a million dollars and live off $40,000 a year. It took some time to let her come to her own conclusions and see the magic of compounding at work but it was worth it. Good luck.