I'm so very sorry. 

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I’m so sorry! My guess is she had an internal injury that just slowly worsened that probably was irreversible. Seizures without obvious signs of head trauma, diseases, or poisoning can be a result of kidney or liver shut down, you did all you could and it’s unlikely there’s anything you could have done to change it given that’s how she passed. What you did do is make the remainder of her life comfortable, which is the important thing.Sadly she started to deteriorate this morning and passed away quietly following a series of seizures.
I'll really miss her- such a neat creature with a huge amount of character