Okay, go back to working inside. Kitchen is a good place. Put some dog treats somewhere handy but up out of sight where they won't be a distraction. Use a tennis ball. Dogs love them and they bounce. That's exciting and helps keep their attention. Get right down on the floor and work with the dog. They love that. Toss the ball a little ways and let the pup run after it immediately. Go right with her and make a big deal out of it when she catches the ball (roll her on the floor, scratch her belly, tease her with the ball, give her a treat, etc.). Get her real worked up and start gradually pitching the ball further away. Then make her sit and wait a minute before fetching. You get the picture. I think you probably went outside a bit too early. Too many distractions out there. Keep it going in the house for a while longer where there's no other distractions and it's close quarters. Just her and you. Try this and get back to me with the results.