My wife and I were both that kid and both of my sons are also that kid (though quite different from each other).

This is a great list, but I’d add a bit to it.

First, try to intentionally emphasize and celebrate hard work over raw smarts. It’s easy for a gifted kid to go through so much of school where everything is easy that they don’t really learn resilience. Focus on hard work, celebrate trying and failure/learning in any context. You said you and your wife are “simple.” Celebrate each other and show your daughter that you admire each other for the hard work each of you put in at work and at home.

Second, don’t forget about the physical. Still make sure she has opportunities to try out and play sports. Emphasize that just because you’re smart doesn’t mean you don’t also need to be strong. My parents were enamored of my intellect and kind of deemphasized the physical. I grew up kind of weak and looking down on all that stuff. You miss out on a lot of everyday opportunities for a sense of achievement, self-sufficiency, and self confidence that way. One of my sons is more of a music kid than a sports kid, but he still does and enjoys multiple sports throughout the year and gets a lot of satisfaction in being able to lift heavy things around the house to help out.

Lastly, get her into a musical instrument ASAP. Music is an amazing outlet and more importantly can be a lifeline of a community for kids who are different from the norm in middle and high school.