My husband was against it at first because a necessary part of starting in real estate investing was moving. We had the nice house with a fence, two dogs and a very young child. It was our home and I was asking him to move to a different town and to a house that would eventual be in our rental portfolio. For him I knew that a little bit of the emotional part of extremely fast tracking us to financial freedom with a lot of showing him the actual numbers was what he needed to hear and see. I was honest that while I was/am using bigger pockets as my 'university' for educating myself along with surrounding myself with the right people things could not go as planned. I doubled the time line I thought I could get us to financial freedom to give me cushion for mistakes etc. This is a recent move and so we are still getting settled and sometimes have those conversations about wanting upgrades that would be normal for our home but probably not for a rental. Overall, I would say that what keeps us on the same page despite having differences is that we believe in the 'why' - we want financial independence.
Do you feel that you have a true knowledge of why she wants to understand? As an example, she might have said she wants to understand and you took that to mean she wants to know the business background and why things need to happen this way when maybe she wants to understand how this will impact her? I don't think that's selfish because this isn't a standard side hustle for you because you both will be moving into the place which has real life impacts for you and her. I would just try to gain clarity on what she wants to understand. Is it the business side, the how she can be involved (swinging a hammer, decorating, screening, handling the money etc), or how this will impact her. If I can be helpful in any other way, let me know!