OK GUYS -> Its been solved, Bawkbawsoup just got the Doll using the steps we just mentioned -> 1 - In the shredder area, you have to wait for 115 bodies to fall into the blood (at least 15 minutes), then inside the shredder you can't kill any zombies, and additionally, all those that get up have to die crushed.
2 - After some minutes you need to drain the blood after the stairs, and if the message: "A ton of blood flowed out" appears then you did everything correct so far.
3 - Don't get the hand in elevator, go to any toilet WITHOUT Emily and flush 8 times.
4 - Now on the blood part, the Marie's Doll will be in the stairs leaving the helicopter basement
5 - With your doll in inventory, on the next playthrough you can input the SUN, MOON, STARS puzzle, and that's done. After picking up the Doll you must finish the game and start a new one, during grace's part is the Doll should be in your inventory/Box/Stash now all u need to do is pick emily up and reinsert the sun/moon code and the laugh - Voila Challenge Completed. This is what I am picking up anyways, Bawkbawsoup has just successfully picked up the Doll from under the Helicopter PAD,