Hi there
My mother, who has had several strokes, had a major grand mal incident in August (rigid, stopped breathing, out cold for almost an hour) Fortunately she was talking to a carer at the time, so she was rushed to hospital. Nobody had mentioned this as a possibility so when the dust had settled I did some research on my own. Apparently, seizures are quite common when there has been some level of brain damage which is now healing. She is now on anti-seizure meds, with, touch wood, no futher incidents. Since you haven't had a firm diagnosis of exactly what caused the dementia, it is possible that she is suffering from mixed dementia (i.e. AD and vascular) The TIA's that contribute to vascular dementia may not be large enought to show up on the scan, but they still cause damage. Anyway, my point is, that distressing as it may be to see, it doesn't necessarily mean that she moving into a further decline. As a side bar, I was astonished to read that the elderly make up a far higher percentage of people diagnosed with epilepsy than young people - I had always assumed this was something that happened to the young.
Jennifer