I'll offer up a bit of a different take on your situation.
It really depends on WHERE in the shoulder you hit her. If you stuck that tip exactly in the ball of her shoulder bone (or whatever terminology you want to use, but meaning the thick end of the bone..) you most likely didn't get ANY penetration, the arrow is stuck there, and she'll pull it out later when she's calm and has a chance to stop and work on it.
In my mind, without a drop of blood anywhere, this is the most likely scenario -- plus the fact you watched her run for over 100 yards without falling.
An inch or two either way and you would have been driving through the scapula provided your bow is properly tuned.
Having said that, you owe her your best effort in an attempt to recover her until you absolutely can verfiy she's still alive.
Last edited by Greg / MO; 09-14-2009 at 07:19 PM.