I'm very concerned for your pup, please have your vet refer Bella to a neurologist/neurosurgeon, preferably at a vet school or specialty hospital.
Do not waste precious time in getting her help, this may be very serious.
In the mean time I would keep her very calm and confined, to prevent serious injury.
My prayers are with you both...
__________________ As Ever, Kathy 
Intruducing Bentley  Winston and Spencer: RIP My Sweet Angels |