The first couple of times that I took Max outside on a leash, he sat down and refused to move. Finally I coaxed him off the driveway and we walked around the block. From that day on, he has loved walks.
Each new surface required coaxing. He was accustomed to walking on pavement, but then was afraid of sidewalks, grass, or brick walks. Like Lulu, he is a very confident dog in general, but had these quirks.
Be confident and patient, as others above advised. Keep your feet facing the direction you want to go. Start to take a step and say, "Let's go!" in a happy voice. Move the leash a little too.
You can use toys and treats if she is motivated by those. If you do not have another person to help you, hold the treat or toy ahead of her. Or even throw the treat or toy ahead of her.
Usually just being outdoors makes them forget about the leash. Practice daily, even if she doesn't move. The more you expose her to now, the better. Good luck!
__________________ Kristin, Max and Teddy  |