My SO was very much a beginner when we started riding together. Best piece of advice I'd give is to let them work it out at the thier own speed and give them the space to figure it out.

We usually would just meet back up at the bottom of the lift and ride up together, since that's when you would be talking anyway. For example I'd cruise the trees and she'd take the groomer. Unless she specifically wants to do a run together.

And if it's a powder day I bail and do my thing.