I have a few suggestions you could look into:
Miss Jessie's Original products (www.missjessies.com - I used the Baby Buttercreme with both of my sons)
Shea Natural (http://sheanatural.com/index.php)
Carol's Daughter (https://www.carolsdaughter.com/)
Those products may not have parabens. There are a number of other products I can think of (Mizani, Pantene for Relaxed and Natural hair) but as those are owned by major manufacturers (i.e. L'Oreal), I'm thinking they are chock-full of parabens!
You also asked about finding something that would "actually work." It's been my experience, especially with hair care, that it's mostly trial and error. You have to keep trying different products, different styles for your daughter (braids, plats, etc.), and even playing around with how often you wash it.