I am sorry to hear you having such problems with your mother's attitude. I am in my 50s so attitudes to curly hair here in Australia are different. I remember my grandmother and great aunts having very curly/frizzy hair when I was growing up, probably in the 3c to 4a range looking at old photos, and my mum had very fine, very thin curly hair (2c/3a). My dad had straight hair which went completely gray at 22.
My sister and I both took after her, and we had 3a curls when we were little, but because we lived in a hot humid climate, she kept our hair in pixie cuts for a long time. When we were allowed to grow it out, I remember mum using brushes on us,so we both had frizzy hair, but we never had any unkind comments from our mum about our hair. I started going gray when I was 15, and mum let me start dyeing it then, her attitude was "it's just hair, it grows back, and its a good way of changing your appearance" so she supported us with anything that we wanted to do with our hair.
Hair type: 2c/3a, fine, med density, med-high porosity
Co-wash: tresemme naturals
RO: garnier fructis nutri-repair nourishing, matrix cb, ytc
LI: sukin, matrix cb, kckt
Sealer: argan oil, coconut oil
Gel: garnier fructis endurance 24 hr, kccc
Dt: matrix cb, alchemy masque
Pt: gelatin, joico Kpak