Welcome to the board, and welcome back to the addiction! Cold water is a bit different than warm, but it has its own unique appeal and beauty.
The best thing for your daughter would be to get a mask and gear that fits well. It's challenging to do with a small face and feet, and at some point she will outgrow it. But if her gear is leaky and uncomfortable, it's going to be unpleasant. If you can get gear that fits, and into a pool (or the lake, or the Sound) to practice in with her, it will make a big difference.
The Seattle Underwater Sports has a pool, so going there for gear and practice would work if they'll let you hop in.
And when you're ready for diving here, we have weekly dives and occasional barbecues/club dives that you're absolutely welcome to join.
Come to the nerd side, we have pi!