I've been working with this sweet little Arabian mare at my barn for a couple months, she's so willing and always paying attention to me when it's time to work. Last week did some groundwork with her, just thinks like yielding her hindquarters and shoulders, backing up, and lunging. After the lesson, I went to turn her out and she took off while I was unclipping the halter. My hand got caught behind her chin and she panicked, thankfully the halter snapped when she reared. Since then she's been super head shy around me, running from me in the pasture, she's not as willing to listen anymore. I feel like I lost her trust, I've been walking her in hand and just doing relaxing things. What can I do to help, why is she reacting so badly?