One of the best ways to gain her trust is to spend time with her and asking nothing of her. If she's in a stall, sit outside the stall and read, clean some tack, but stay close to her. If you'r safe, sit just inside the stall. Be part of her herd of two, you and her. She's young and needs company. I will often just go out in the pasture and walk with the horses, looking where one may look, bend over and stir the grass with one hand as tho grazing. Try to spend a lot of time with her just being there for 4 or 5 days then perhaps take her for a walk. Don't hold the lead close to her jaw, rather hold it about 30" away from the clip. This is easier on you and she doesn't have to walk with her head tilted toward you. Use a rope halter for better control.