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She can play your steam games in offline mode without affecting your online activity. As long as the game developer/publisher allows offline use.
Obviously doesn’t solve all your problems but figured I’d mention it if it gives you more flexibility.
I do know about that, but I want it to be as easy as clicking on a game to play it without worrying about toggling the mode. I know I could make a separate account for her too, but we share machines and again that becomes a barrier when wanting to just click a game to play it.
In this niche case, gog is just plain better.