Ganny blinks? Maybe it's because my computer is crappy and I had to make the graphics lower quality, but I never saw her blink. Part of the reason I think that Granny might be dead is because most versions on Little Red Ridding Hood, grandma get's eaten by the wolf. However, if Granny blinks, then I admit that I am wrong about that. But she never moves... was that Tale of Tales being lazy? I would think when the girls come in for the "failure" endings she would at least turn her head in some sort of greeting.
Ah, my little pet theory, the girl in white. First off, you mentioned that the stuffed wolf in Grandma's room is white, and the little girl is also wearing white. While white is symbolic of innocence, it also connects the girl with the wolf. Due to the odd nature of the little girl in white, if she is the wolf, who is to say that she can't fabricate other people? After all, the woods are pretty messed up as it is... I don't know about you, but I don't often find my living room furniture strewn around the forest. And since the "endings" for each girl are so metaphorical, it isn't too far a stretch the the little girl can create visions.
Once the girls find the "Wolf", the girl in white no longer tries to take them back to the path. It could be saying, "I tried to tell you to be a good girl, but hey, if you don't want to listen, here is your punishment."
I think Ginger's "wolf" proves my point the most. Ginger is so far into her imaginary world, that the girl in white doesn't have to pretend to be innocent anymore, which is why she is in red. This is the one girl that she doesn't have to hide who she is, and I think that they are supposed to be the same age.
What really made me think the girl in white is the wolf is the prologue and the epilogue. I don't know if you downloaded the prologue. Basically, it is the girl in white running around the forest, and instead of the usual land marks, the places are reduced to ash and smoke. *spoiler!* In the Epilogue, it is raining, as it always is as the red girls finally make their way to Grandma's house after encountering the wolf. She comes into grandma's house and sits next the bed in a pouncing position. After it fades, the girl in white is standing in the starting room with blood smeared on her dress. She appears that way almost as if to say "fooled you!"
On that note, did you notice that as the girls get older, the wolf a) becomes more humanoid and b) get's older? Also, have you ever read the original story? It's called Tale of the Grandmother if you are not familiar with it.
It's fun debating with you!