There is some evidence that there is a genetic component to bipolar affective disorder (both my mother and uncle had it. However its manifestations vary widely: mum would go hugely hyper over about a week and be able to fly, walk on water and smash up hospital television, then drop like a stone a couple of weeks later and take two years to crawl out of the black hole into some sort of normality until something else happened to set her off. Sounds like your service user cycles very rapidly: people who are deeply depressed aren't disruptive as they haven't the energy or motivation (not even to harm themselves). Is the diagnosis certain? What medication is she on - lithium?
When did it start? You need to show arrested or incomplete development of the brain (something that has no medical meaning at all according to doctors I know. The best guess for psychotic illness is that it is to do with brain chemistry - which is how medication manages to work at all, when it does: by making the brain work more like a "normal" brain. I learnt recently from one of my doctor friends that many people have just one psychotic episode and after treatment are substantially recovered. It might be hard to show the development thing if it's just a phase the body is going through!
Anyway, can you form an impression of her intellectual ability? Can she read, write, do maths? What sort of school, if any, did she go to? Did she pass any public exams like GCSEs? The severe impairment of intelligence referred to at 55 IQ, whatever that means, is associated with moderate learning disability - people who have difficulty acquiring literacy and numeracy. There are however some useful cases on autistic spectrum disorder and functional/socail intelligence: it's no use having a high IQ if your mind is so screwed up you can't use it and have no insight into anything.
Real problem is as with 99% of all known illnesses that everyone is affected differently: it comes down to facts. Have you asked her spychiatrist/CPN is she has such a thing?
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