I am sorry to hear you are so worried about Zoey. My name is***** am a veterinarian and will do my best to help.
Bell's palsy is paralysis of one nerve, the facial nerve, in people. This makes the muscles on on side of the face to droop. It sounds like Zoey has more than paralysis of the facial nerve, if she is losing vision in one eye, her left paw is swollen and she is clumsy on the left side, and has lost her voice. It sounds like more than one nerve is affected on the left side of her face and leg. She may have a disorder of multiple nerves, a brain tumor, a brain infection. Conditions of the nervous system do sometimes get better after awhile, but it is best to find the cause and if there is a possible treatment.
If she were mine, I would consider testing for some of the tick borne diseases. I would also consider a consultation with a veterinary neurologist.
I might try a combination of doxycycline, clindamycine and prednisone to treat for possible brain infections and inflammation.
I would ask your vet for a referral to a neurologist if there is one in your area.
Please let me know how she is doing and what other questions I can answer.