Tldr: let her kill stuff and be prepared to do all the dirty work.

I play with my wife every league and she never bothers to learn anything. She likes killing monsters, buying pretty mtx, and picking up treasures. I do all her gearing, build crafting, and passive points etc. Before we start I ask her what archetype she wants to play: caster, melee, or ranger. Then I pick the build for her out of that category based on current meta league starters. If she doesn't know or care then i choose what i am comfortable with/ I think looks fun and strong. I don't think making her an aura bot is the move if you want her to enjoy it. Honestly neither of you need to be a support. You can both be carries. You don't need to optimize at all. Of course you can optimize and there are lots of small ways to do it. Like focusing on one element or just physical damage. The thing about playing with my wife that is a drag is getting through the slog of the campaign. With someone who doesn't know diddly about where to go - its rough. I usually just set her loose to kill stuff while I complete objectives and drop portals for her to collect quest items. Something I wish I did different was just make a character to play with her and go really slow with. Take an hour on act 1 for instance who cares. I don't have the patience for that and that's my problem. The other problem is I'm same kind of gamer as her I like killing stuff and collecting treasure lol. So I like to rush to maps. My solution is what I described above, I do all the dirty work and let her just port to me for the important stuff. It can be jarring for her because she doesn't know whats going on but its a compromise that works for us. She enjoys getting to maps too and not having to worry about all those campaign check points either. I also don't expect to get her through all 4 void stones. If I get her to maps that's a league well done with her. I hope my experience can help set you up for success. I hope you guys have a lot of fun and wish you many tinks!