Hello all! So sorry if anyone has found this out before but I thought I might share my method of how I fixed my g2 magic motion floral! (Magic Motion moonshadow pose)
One of my three G2 Floral's has the broken neck issue where her head would not stay up normally, so I messed around a bit seeing if I could fix it.
What I did was I pressed and held down the button on her tail/bum and then slowly pulled up her neck until it was upright, there was a small bit of movement inside her during this and its fixed her up! She now works like normal and is a part of the family
I hope that this may help others out there with broken pony necks!