Well, to know if Kala is a real story, we need to look at the source and the evidence presented. If it's well-documented and verified, it might be real. But if there are inconsistencies or no reliable sources, it could be more fictional than real.
Since I don't know the exact 'Kala Brown story', it's difficult to tell. Maybe she is an ordinary person with her own unique experiences in a certain community, or she could be known in a particular field like art or sports, but without more details, it's impossible to accurately relate her story.
Kala jadoo in Urdu novels can be a very interesting and complex concept. It might represent different things depending on the context of the novel. Sometimes, it could symbolize the evil or the unknown forces that are at work in the story. It may also be related to superstitions and cultural beliefs within the Urdu - speaking communities that are reflected in the literature. In some novels, it could be a plot device to drive the story forward, for instance, when a character discovers that they are under the spell of kala jadoo and they have to find a way to break it.
It depends on how you define 'based on a true story'. While it may draw some elements from real-life, it also incorporates fictional elements for dramatic effect. So, it's a blend of truth and creativity.