First I'm really glad your OK!! Scary stuff there.....Hope you find some blood and your deer!! Sounds like you might have ticked a limb and it made the arrow hit her at a funny angle, and high.... If it didn't go through her it will take some time to fill up and bleed out......she may be right where you heard her slow down and stop....
Geezzzzzz.. Glad you got out Mike... And glad you got your boot back.. At least you dont have to worry about rain tonight... Good luck...