Congradulations on your first stick and string kill. Sometimes too what blood that does come out is soaked up by the hair and doesnt make it too the ground. Its weird sometimes you can have a heck of a exit wound and not find a drop of blood on the ground. Luckily you saw where she ran so you had a starting point to look if you didnt find blood. You could also look for other signs besides blood, like dirt kicked up, leaves turned over and places were the grass was disturbed to help track if you dont see much blood.