its a crappy feeling, but if you hit her high, and diddnt hit her arteires, then you wont get any good blood trailing, did you gut her? if you did you would have been able to tell what happened, Her chest filled with the blood, and until the blood got to the hole she wont loose any... SO, its not your fault.

I shot a doe 2 years ago in rifle season with a 180grain 30-06 at 90 yards broadside, hit her high, went to the spot found some fur and a drop of blood no bigger than the end of a pencap, and that was it, she ran maybe 800 yards before she piled up, i gutted her out and as soon as i punctured the diaphram, blood was EVERYWHERE i mean that in every sence of the word, it was insaine how it worked out, Dont feel bad she will feed many other creatures, nothing you could do.

Dont feel bad it'll happen to everyone every once in a while.
Ryan.