I think she didn't spin. Besides the constant com via ACARS, the Vertical Stabilizer could not have sustained that load. A spin would involve too much immediate roll to deal with as well. Level the wings (or at least center the ailerons), stomp the Rudder, and PUSH to break the Stall. 150 tons; wouldn't have entered a spin or recovered if it had. This is what the "Intact at Impact" suggests, deliberately or parenthetically. If the Elevator was used in this fashion, and failed (separated), it would have been "Up".
The same way as the water would have failed it.
The airframe was yawing left at impact, and flat, (minor NU), with a left wing low. (BEA).
Large Vertical velocity (vertical acceleration at impact). What does that say? If nothing else, it means it was falling, fast, ie, losing altitude at a rapid rate. If she began her descent in the deep vertical, and finished the same way, there isn't much forward progress to send the searchers 70 miles out. (Great Bear).
bear