Hi
What race is your client and what color is her hair, and if you have worked on different types of afro hair, would a mixed raced curly hair type be the closest?
REAL, and i can't stress that enough lol, but Real brazilian hair comes usually in 3 types or curl which also includes deep curl and a great length range.
I'm mixed raced and know both european and afro hair types well and have been able to use brazilian deep wave on my mixed raced clients and used brazilian wavy.
Brazilian hair is still soft, it's simular to indian but moves nicer and each hair strand isn't as thick/pointy..... but also it never looses it's curl as it's real and not steamed.
Unsure what your clients pay for quality but if she could use Brazilian hair and is willing to pay for the quality as i don't agree with steam processed hair... she will be very happy with the results - but it is a lot more expensive than indian hair which i don't use a lot of either but it will really last her over a year, possibly 2 if she looks after it.
If her hair doesn't match any brazilian types (and i couldn't find any natural curly hair) i personally wouldn't do it as i would only use good quality hair that will also achieve a good result so either one would end up being compromised.