At the end of Where the Crawdads Sing, Kya is acquitted for the murder, and Kya realizes that she loved Tate all along. They start a life together and turn the shack that Kya lives in into a nice cottage. As the years pass, Jumpin' passes away, and Jodie gets married and has kids that he brings by.

Did Kya disguise herself on the bus?

(view spoiler) I think we can assume that, despite how absurd the testimony about the disguised individual seemed to be, Kya was the guy in disguise on the bus. But the case against Kya was largely built on prejudices and they happened to find evidence that supported their prejudices along the way.

Is where the crawdads sing a true story?

While there are several nods to Delia's own life in her novel, it's unlikely that Where the Crawdads Sing is based on a true story. However, Delia and her husband were connected to a real-life murder in 1995, where they were the primary suspects in the shooting of an alleged poacher in Zambia.