Leia was a not-Jedi for all three original movies. I don’t think of her as a Jedi, she didn’t think of herself as a Jedi, and it would have been weird for her to suddenly be a Jedi in the fourth movie.
The 30 year time gaps helps all of these issues both with our perception and Leia’s potential “conflict” regarding embracing being a Jedi.
I get that, I’m just saying it would have been jarring and I’m glad they didn’t go that route. I wouldn’t have said it “ruined her character” or anything silly like that.