I’ve actually looked into it and it appears that she may have had a stroke, I’m taking her to the vets in the morning to make sure she isn’t in pain and to see what her quality of life could be like going forward.
From the posts and videos I’ve seen she doesn’t seem even nearly as bad as other cases so I’m hoping for a good outcome, she’s quite an old girl now so hopefully I can help her to live out her later life in peace and comfort