Man, Copper can be an obnoxious witch all day if she wants to be because she did SO WELL this morning.
We were out having our morning cigarette and coffee  (she was having kibble), and all of a sudden she went tearing off toward the stream at the property boundary, barking and growling and alerting.  After making sure all the cats were inside and nothing like a rabid dog was crashing around over there, I was like "Git it!".  She went bounding across the stream and started barking and growling and alerting at a specific spot.  I couldn't see a damn thing, so I went down there and she had this HUGE possum cornered.  It wasn't hurting anything, so I told her it was ok, and then we went back to the house.  She remained interested, but this was the first time that she took clear, independent, protective action and called me over to investigate and assess.  And then followed my direction.
She also chased a chicken back into it's pen that had flown the coop, and I honestly think she maaaay have been putting it away vs. playing/hunting.  She's done that with this one several times.  As soon as it took flight and was clearly going over the pen fence, she instantly lost interest and went on about her doggy business.
For the first time, I truly felt like I had a working partner, for sure.  And she is just under 18 weeks old.  I cannot wait to meet 3 year old Copper.
Edit:  She just chased the hell out of another chicken I was putting away, and I'm 90% sure she was herding it for me.  She knew where it was supposed to go, and was keeping it right at the gate to the pen.  The chicken of course, was panicking.  Copper was clearly not playing.  But she remained verbally controllable when she wasn't actually running the chicken, and kept checking in with me when she was, which tells me she was in her right mind and not in hunt/prey mode.  Really fascinating!
Today has been incredible.  After the previous 20+ pages of experience, I however, am waiting for the other shoe to drop 
I also had the fleeting thought that I might need to get one of her siblings someday down the road before I stopped myself from the insanity.
2nd Edit:  Today remained incredible.  Wow.  Is this what owning a dog is supposed to be like?!