I don't know who your playgroup is, but it sounds like it might be worth finding another playgroup (I'm not saying ditch your current one, just find another one). I think one of the best ways to learn is to have a playgroup that is willing to help you learn as well. It's great that you're trying to help her, but it's better if everyone at the table understands that she's still learning and will give pointers as well. When my friends first got me into the game a few years ago, a couple of them generally played higher-powered decks and it was a bit of trial by fire for me, but they were at least willing to explain what was going on, explain play lines or combos, help with threat assessment or optimal plays, etc. even if I didn't understand it at the time. The people with whom you play determine how good your experience is almost as much as - if not more than - the decks do. I'd rather lose and have fun than win and not have fun because I play the same infinite combo every time.
On that note, the other thing I would say is power down decks and play more casually. I don't think I've looked at any of your other decks, and Rat tribal is pretty straightforward, but it is also quite threatening; you bring a rat deck to the table and immediately you put a target on your back. It's fine to want to play something like that, but that must come with the understanding that you
are a threat before the game even starts. The less competitive the game, the easier it is to learn in my opinion.
If it's certain mechanics she's struggling to grasp, maybe start by building something simpler to understand basic mechanics and build up from there. Maybe go through an archetypal deck of each color (green ramps a lot to play big creatures, red likes haste and burn spells, blue draws cards and has counterspells, black plays with the graveyard, white does... well, nobody really knows
). When my friend tried to get his wife into the game so she wouldn't feel left out when the guys got together, he built her a Dinosaur tribal Gishath deck. It was relatively straightforward "play big dinosaurs and punch face" deck with just a couple special interactions or mechanics (in this case,
Enrage triggers and how and when to use them) for her to focus on learning... she hardly ever plays it because she literally doesn't have the attention span for a commander game, but she at least understood how to play it and enjoyed it. I think if your wife can "master" a specific deck or two (and, to echo what someone else said, that features a play style she likes), she'll get more enjoyment out of the game; once you've learned the intricacies of
your deck, you can start to focus on how everyone else's decks work and how they interact with yours.
If it's strictly rules - for example phase order, passing priority, what actions you can and can't respond to, how the stack resolves, etc. - that really just comes with repetition. The same goes for general game knowledge. Threat assessment is difficult when you've never even heard of half the cards in your opponents' decks and don't know certain combos (I've played for four or five years now and there still is not a single game where I don't have to ask, "What does that card do?"). It is very much a learn by doing game. Many interactions don't seem to be intuitive at all, and I still get stumped trying to resolve certain things. Magic can be super confusing and is incredibly complex. In fact, it's actually
the most complicated game, so much so that you can build a computer with it (in the literal sense of the word - you can create a Turing machine with it). Playing can definitely be discouraging when you're constantly bombarded with new interactions and weirdly specific rules.
I'll be honest, Magic seems much harder to learn now that it was even three or four years ago because of all the new mechanics they keep introducing, not to mention that now ever single card has a giant block of text on it and vanilla creatures are basically nonexistent. I don't envy new players nowadays with the
deluge of new cards and hundreds of potential new commanders every year. It is something you have to
want to learn, not something you can just casually pick up.