This may sound harsh, but your mum's lost it, and is a danger to the mental and physical (at least in the case of your sister) health of the rest of your family if she keeps up this shit.
There may be reasons for this behaviour, and no, I don't think she's enjoying herself in the end, but she needs professional help, whether she realises or not.
I've seen this sort of thing happen a few times, and the earlier someone (counsellor or government department) steps in, the better it works out.
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