I'm sorry to hear that Tiger's seizure and other symptoms are worrying you.
When a cat has a seizure, the underlying cause must be diagnosed, so she can be treated most appropriately. However, there ARE seizures for which there is no explanation and these are called 'idiopathic' seizures. If she has epilepsy (the most common cause of seizures), she will be put on medication to control them. Because of her senior age, she's more prone to develop diabetes, hyperthyroidism, liver and kidney issues and seizures may be caused by these conditions, in addition to others.
Tiger would have to be examined in person by a vet and some lab work would have to be done. Imaging, like an x-ray, might be done on the foot/leg on which she is limping. Your vet might also refer her to a neurological veterinary specialist, if s/he has no information for you.
I hope all will be well with Tiger and please let me know how she's coming along. Thanks!
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