Thanks for choosing health care magic for posting your query!
People at 50 yrs develop such kind of abnormal behaviour and this period is called senescence. The perimenopausal period can be adding up to the trouble. However if such symptoms are causing you and herself distress, then it is a cause of worry.
There could be two common reasons for such kind of behaviour. One could be a depressive episode which needs to be diagnosed by a proper interview by a psychiatrist
. The other concern can be a alatent Dementia
. Does she forget things often?
In either case you need to see a psychiatrist who will interview her in detail and advice you some medications and psychotherapy
Hope I have answered your query.
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Wish you a good health!