If you ever thought that one key was enough to secure your front door, know that Granny locks her door in at most 7 different ways. You've been kidnapped by her and you need to find an escape route before you're killed.
Unbaked Granny's Texture
There is a copy of the model with an associated unbaked texture. The texture is used only on the additional eye mesh, which is hidden in the head.
Granny's model is also referenced as SlendrinaMom and GrannyTest6.
SlendrinaMom makes sense as, revealed in the other games. She is Slendrina's mother.
However, GrannyTest6 possibly means this is the sixth model they've made for Granny, and just perhaps decided to stick with it.