Well, if you’re going to juggle blood and fire like that, I’d advise having a clear picture of what you mean by…
There’s “optimal” in the sense of doing things the best possible way that will produce the best conceivable results. Perhaps your partner is a very driven person, ready to do all of these things with a lot of heart and consistency. “Optimal” takes on a specific meaning in that context, and I’m not the best person to tell you what that looks like.
Then there’s “optimal” in the sense that your partner doesn’t start hating lifting, or hating your guts. She learns to enjoy lifting and what it does for her, and manages to make lifting a thing that she does productively, either on her own or as an activity with you. I’m a firm believer that, for beginners at least, the best lifting is the lifting that you do.
I’ve tried both, and failed with both, so I will speak more to the latter scenario. I think the basic movements you’ve listed are a pretty good thing to start a rank beginner on. Others may have better ideas, but I’d strongly advocate keeping things fun AND productive FOR HER, and not worry about whether you’ve optimized this or that.
Not yet at least. Get her hooked first, and THEN break the news that 20 rep squats start today.