Our expert says:
Try to work out a way to have her seen by a psychiatrist ( who you can introduce as a medical specialist ) for a proper asessment and diagnosis. Sounds like the onset of dementia, which can have a number of causes, some of them reversible, some of which we can delay the worsening of it, some we can't do much about, but some medications can help her be more cheerful and even tempered. Even with "normal" aging and senility, one of the areas of brain often affected early on are the areas that provide us with common sense and a sense of propriety - the areas that stop YOU from swearing in situations where it would be embarassing and unhelpful.
The main initial problem in the sort of situation you describe is to find a way to help her agree to be seen and assessed. If she has any physical and mood complaints she would appreciate having attended to, that's very useful
Meanwhile, understand that its no longer the full mom you used to know, who is now swearing and behaving badly.
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