I second trying it out for a little while. If you really like the effect you get (for me, my hair instantly improved using CG), explain to your mom that you are still cleaning your hair, you are just using a milder soap to do it... Using shampoo on your delicate hair is sorta like brushing your teeth with bleach: it's overkill for most curly-haired folk. Switching to the hair equivalent of toothpaste just makes sense. She might feel differently about it if she understands you will still be cleaning your hair.

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You can't stop my happiness 'cuz I like the way I am! -Hairspray
Dangerously open to product suggestion
3b, thick, angled bob, coarse, low(ish) porosity.
Poo (when I get buildup): Bumble&Bumble Curly Shampoo
Lo-poo: L'Oreal EverCurl Cleansing Conditioner
LI: Aveda Be Curly Prep
Stylin': Aveda Be Curly Curl Enhancer for a natural full-bodied look, SheaMoisture Smoothie for finger curls.