So, I know you didn't want any armchair psychologist replies. And I don't think this is one, exactly. But as an entrepreneur myself, I do have a couple of observations:
First, you say that you came up with the idea. As someone who runs her own business, I will tell you that if I wasn't super committed and passionate about it, it would fail. Because it is a fuckton of work. I have no sense from your post whether your wife wants to do this, doesn't want to do this, is indifferent, etc. But: just your phrasing that you came up with this idea, instead of her, is a red flag to me for that reason. If she is hugely excited and passionate about this idea, then okay, disregard this point.
Second, you say she has hated every job she has had since you met her. Do you, in fact, think she will like/love this one? Or would she be better off just not working at all, for example, and I dunno... choosing a volunteer gig she really likes? Since you don't need the money?
I know you said you don't need this to make money. But you do want her to be happy. If this business is a failure, or not profitable, or is a ton of work that she will not, in fact, enjoy doing, then will she actually be happy in the end? It is a question to ponder.