Here is an other idea. This is a low shot, but not a "shave job in my opinion. A shot that low should not have resulted in a broken shaft ... unless the doe stepped on the blt as she ran off. Laugh ... I had this happen bow hunting many years ago.
I have a theory to offer. May be way, way wrong ... but. The bolt passed through the onside of the deer, very low. The broad-head struck the off-side foreleg and stopped from passing on through. Maybe it struck the large fore leg bone. The rear of the bolt was buried to the hilt more or less, but still exposed. As the deer ran, the scissor motion of the forelegs sheared off the rear of the bolt.
I would still expect to find some blood along the path that the doe fled, if for no other reason that there is "cut" flesh.
Any progress made ???