Dear friend,
It is likely your cat has an inner ear disorder called vestibular disease. It resembles motion sickness in human and causes these symptoms. You can read about it here:
http://www.marvistavet.com/html/body_vestibular_disease.html
Please print this out and show it to your vet. He should stop the steroids and the valium immediately as only the antibioics are necessary. In fact, the valium will make her even more confused and disoriented.
Please let me know what he says and how she is doing.If you still have questions - I will be happy to help.
Very sincerely,
Terri
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri