I'm a 2c and low porosity (:
I have thick hair, though, but I hope I can still help. My mother has fine hair, but both she and I LOVE Shea Moisture Raw Shea Butter Moisture Retention Shampoo! It's wonderful and moisturizing without being greasy. I only use a dime size. I don't know how the matching conditioner would work for her, but it works on my thick hair excellently as a leave-in. Maybe she could just use some on her ends or use it as a rinse-out? It's also another that's a "little goes a long way."

Beautiful Curls Leave-in for Wavy to Curly Hair was kinda too light for me, so it should work well for her. Beautiful Curls Gel for Wavy to Curly Hair is great! It's also a little light for my hair, but my fine-haired friends like it a lot(:

All of these products I mentioned are all-natural, btw.(:
2c/2b with some 2a, coarse, dense, thick, low porosity
Growing out a CL bob. Currently at APL.
CG again as of 7/20/12

Cleanser: BRÖÖ Smoothing I.P.A. Shampoo
RO: Trader Joe's Nourish Spa Conditioner
LI: Kinky-Curly Knot Today
Styler: Beautiful Curls Gel for Wavy to Curly Hair

all-natural products, light moisture, humectants, argan oil
silk protein, synthetic ingredients, heavy oils/products, cowashing