I managed to consult with our vet today, about Shania's wobblyness. Our vet said she won't be able to tell anything by looking at the video that Erica had sent.
For a proper diagnosis, a physical examination is needed to check the reflexes and neurological functions.
It is like what was done for Wolverine and the other wobbly cat that Mira Ahmad brought in last time.
Methycobal is a stronger medicine for addressing nerve problems, compared to Neurobion, so the medication is suitable.
I have conveyed this to Erica. We hope Shania gets well soon.