Give her important things to do. When she succeeds, she'll really feel good about herself and might even want to make that duty her very own special contribution to your outings. Keep it up. She's getting tougher now. She knows that she's not going to be a stone's throw from the car.
Safety is a little farther away and there's more perceived risk.
Now you can let her help you plan the trip. This could give you an opportunity to enjoy the serenity of the wilderness with out idle chatter. Remind her that you won't be far away and that you'll be close enough that if she blows her whistle once, you'll hear her. It's good to set up a signal, such as a whistle pattern so that you'll be able to locate each other. When the trip is over, make sure you talk about your experiences together.