Hi Deb, about 3 years ago my slim daughter was trying to maintain her weight but I kept on serving large sized meals (which is what my mother always did for me)
She would then get a bread and butter plate and pick off what she wanted to eat ie one third of the meat and a few spoons of the vege and none of the mashed spuds or whatever.
I was a bit slow in learning, I'd apologise for giving her too much but would do the same again for yet another 3 days.
Her curt words hurt me and brought tears to my eyes (because I felt I was only feeding her because she wasn't getting enough) but her words were essential. I then learned to serve her what I call a childs portion.
Let your mother rant and cry, it's something she has to get over like I did.
If she continues, I'd let her know you'll be preparing ALL of your own meals.