I would take her to the vet ASAP....but depending on her age could be an inner ear problem causing the neck to go sideways....I had a corgi do the same thing and then my 13 year old yorkie ended up with the same thing but is now better. There is a nerve in the ear that can cause this and no it isn't the sublextion thing
So I'll pray it's the inner ear and not the other!
Donna Bird
Brooklynn's Yorkshire Terriers