So, good advice, but I just want to point out that if Poonam is basing this manuscript on a story that was told to them in their childhood ("the story as I remember it") by a member of their family (for example), there may be no need to check into existing published/copyrighted works, because by definition it's not based on a published/copyrighted work...
I suppose what they heard could have been their relative re-telling a story that THEY had read, so to be on the safe side I would want to check to make sure it's clearly different from anything that's been published.
But if I understand the original post correctly this is a different situation from the usual--creating a retelling after reading existing versions...