Ok. Stop and breathe.
You have to really compartmentalise to get through this.
Her behaviour has nothing to do with your value- it’s all about her and it’s the best she can do. She doesn’t understand genuine reciprocal relationships, only the superficial appearance of it. She needs you to ‘look like’ a loving daughter. When she criticises it’s because she’s ‘hurt by your behaviour’ or because she ‘only wants the best for you’.
You have to let her be her, and find a way of being and protecting yourself.
For a start, accept the money. Buy yourself the eggs. Keep some of the food in your car so she doesn’t get wound up about the storage issue. Leave before lunch today as there’s nothing for lunch.
I take a big bag down with the things I need for comfort. I keep it elsewhere as she would want it all I she knew it was there. If I take coffee bags for example, she’ll use them up so I don’t have enough for the visit.
If it helps to know you aren’t alone, I give you - only one comfortable chair in the house, no food, consuming my food, no presents worth the name (second hand, don’t fit, not something I’d want in a million years), being literally a millionaire but expecting her young adult grandkids to pay for ice creams/fish and chips when they take her out etc.
And a continuous mind numbing stream of complaint and criticism such that you can’t summon the power to remember your own name.
A trip where she doesn’t reduce me to tears is a massive success. She has a talent for it!