My hair is very, very straight and fine, before getting here a perm, i would try a couple of things, take her hair into one bunch and twirl it into a tight bun on
top, more just like putting it round and round and pushing ends under, then i take a scrunchy and put it around it tightly, i do this when my hair is damp, not wet and leave it while i'm busy, then take it out later in the day or if i'm going out, it gives body without chemicals.
Having been there and done that with regards to perms, i would caution you and also, they won't stay in as long as with other types of hair. Also when it comes to growing them out, you end up with very straight hair on top and wavy/curly on bottom.
If she's really set on a perm - a body perm could be an idea - it won't be super curly, and won't last as long as tight curls, but it will give a more natural look and be easier to grow out.
I use herbal essence and panteen and interchange them. I'm going to try the dr. brommers i have in the closet.