I don't have enough information to say for sure. It could be fiction, or it could have roots in reality that have been adapted or exaggerated for a particular purpose.
Well, the term 'b93 roofsit for kids' is very ambiguous at the moment. It could potentially be a special project or event with the code 'b93' related to kids sitting on roofs, which might be for fun or some educational purpose. Now, Katie in Katie's story could be a child who has a unique experience during this 'roofsit for kids' activity. For example, she might have overcome a fear while on the roof, or she could have learned something important during this time. But again, this is all speculation without more context.
In Sierra Vista, there was a story about a hiker who got lost in the nearby mountains. As night fell, he started seeing glowing eyes all around him. He felt like something was stalking him but couldn't see what it was. In Sacramento, there are stories of a cursed alley. People who walked through it at night often felt an overwhelming sense of dread and some even claimed to have been physically pushed by an unseen force.
The story of Anger Sierra might focus on Sierra's battles with her own anger, how it shapes her personality and the challenges she faces because of it. It could also involve her growth and transformation in dealing with this emotion.
I don't believe it's true. Most of the time, when a story has a name like that, it's made up to capture our interest and take us on a fictional journey rather than being rooted in reality.