As has been stated, 5 inches of penetration would be enough to kill her if it hit vitals. If your up and down was good but you were forward you probably hit her shoulder bone (not the shoulder blade which is easy to penetrate) but the actual bone. Its a tough bone to crack let alone get penetration afterwards if you break it. Now it you did hit that bone and didnt break through it, there is a chance your broadhead rode around the side of the bone five inches in and you punctured a vital. Gte back out there and look buddy.

Another, you've shot and practiced all summer, worked hard and now you are somewhat blaming your broadhead. If the shot was forward, thats not the broadheads fault. You know darn well you can shoot, so stick with your current head and you'll make that shot next time.