It takes a great deal of respect and trust to slap someone. In a way, you wouldn't let anyone slap you, except for very close family for example.
And if you were being a dick (like, REALLY a dick) you might appreciate if someone brings you down to earth and back to reality.
I SERIOUSLY DO NOT ADVISE SLAPPING WITHOUT SOME FORM OF DISCOURSE, DISCUSSION ETC.
Please, please, TRY to talk to her.
Tell her the TRUTH, tell her what you FEEL. Try to be impartial, don't just complain or point out negatives/faults
Tell her what you WANT and what you EXPECT. Be positive and focus on all the good in your life.
Let her know the situation with regards to others: family, friends, counsellors, doctors. It doesn't have to be like this. She probably hates social care/counsellors getting involved in her personal business. She likely wants privacy and understanding with her trusted and beloved ones.
And most of all: PROVIDE AN ALTERNATIVE. Give her OPTIONS.
Hot food cheers the soul. Eating mitigates drunkness. It is difficult to be drunk AND sated.
Rib-sticking food, oily, fatty, sugar or salty food changes brain functions and makes us more agreeable.
Don't over do it! Food alone can't fix anything, but love and trust can do much. Be sensible and make the right choices.
This is part of psychology.
It is also known as "comfort food" which might be something she ate as a child, something she made for you as a mother, or some other obscure meal
She probably made 100s of meals for you.
Bear in mind: COOKING is a FAMILY activity and has been for much of history.
Close bonds, skills, learning, expertise and inheritance are mixed in cooking.
We learn it from the people who cook for us (our parents). There's a reason family recipes are honoured and passed down. It leads to traditions
It is a family act to come together at one table and eat the same food, made by your own hands with love and care, for those you love and care for.
As it was for Jesus to dine with his disciples, break bread and drink wine together.