We'll need to spend a good deal of time on safety drills this spring. If either of you are aware of a website with safety training videos, I'm all ears.
The road itself is a great teacher. When I started riding a lot a decade ago, I used to say that my objective was to stay alive long enough to learn the safety skills I needed. Some of the safety skills you need to know are not very intuitive. E.g., it's not very safe to ride within inches of the edge of the pavement. It's actually safer to ride farther out. Most accidents don't involve a car. You also learn that the cars approaching from behind are not your major risk, especially in populated areas. The biggest risks you encounter are at intersections, from turning traffic or from traffic entering the roadway. So it's key to ride in a manner that makes you visible. In many cases, that means riding well out from the edge of the road. And you need to understand where other dangers come from: opening car doors, potholes, cracks in the road, debris, wet leaves, dogs, clothing caught in wheels, crosswind, etc. And understand how to take lines through corners on fast descents, how to brake before and not in a turn, how to lean the bike in a corner, how to avoid and deal with shimmy if it should happen, how to keep your brakes from overheating, basic safety checks to make before every ride (ABC = Air, Brakes, Chain), the proper way to wear a helmet, shifting your weight back when braking hard, when to use the front and/or rear brakes, using hand signals, looking back without swerving, why not to ride on the sidewalk, when to take the lane, etc.
Have your daughter Google "bicycle safety" and read what comes up. She and you can read about everything I've mentioned above and more. Then go out on the road and practice. Ride behind her so that you can see how she's doing.