I had a similar experience earlier this fall. Shot a doe at close range, but due to me not focusing and looking to see if she was looking at me, I hit her in the shoulder. She ran out of there fast. I watched her run for about 50 yards. Tough track to find blood. Myself and two friends tracked in the dark for two hours, blood trailed stopped. We found the arrow, fully covered in blood, a fair ways from where I shot. It didn't seem like lung blood to me. Deep red, not pink and frothy. Muscle wound. I think the arrow may have defected off the scapula and up through the back, not hitting vitals. If it went through her scapula, and didn't hit vitals, well it just wasn't her time. Went back in the morning with another friend, and my dog, tracked for two more hours. Didn't find anymore blood than the night before. I was discouraged, but stuff happens when hunting. If she dies, or was dead, she is a good meal for the woodland creatures. If she lives, maybe I will see her again. I learned a valuable lesson about focus, and about tracking. Stay positive, you will get another chance, and be successful!