Top 1/4 Ok then I'm almost positive she's just overwaterred... I have been using like 1/4 strength nutes for seedlings, I think (250 ppm). AN sensi grow for coco a and B. I was advised by another reputable member to always use some nutes. And that not doing so it will disrupt cations in the coco.Your not feeding nutes are you?
She looks okay apart from the leaves curling, only water her when the top 1/4 is dry.