Model on blender looks different when in Unity

So I've been trying to create a female character for these RPG characters in our game. What I did was to put a hair on the character and join them as a whole (in the body)



but when I changed the mesh in Unity.



The hair was on the side of the character and it looks like it has a stiff neck lol.



I'm pretty new to both unity and blender. Does anyone know how to fix this? Or is there a problem with my model or the animation? It would be a huge help for our project.

 

I'm guessing it is something to do with you possibly moving things around in object mode in Blender instead of in edit mode...look up "apply transform" to see what I'm talking about. I could be wrong, but that would be my first guess.