For what you are doing, I would go with two hubs. You COULD as you guessed use Actiontiles to do what you want - but, it becomes funky when you add in Google assistant and you BOTH want to say "turn off the living room lights". Get one hub for you and call it one location, then add a second hub for her - under your account - as a 2nd location. Exactly what I do now for two homes in opposite parts of the country. If you then want the Ability to have HER control something on YOUR hub or vice versa, you could create custom actiontiles panels as AT can work across multiple locations (although you need a license for each location). The hubs are cheap (at least here in the US) so no big deal.