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.
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.
Madam Ronghua and Madam Xuanhua were two palace maids during the Sui Dynasty. Madam Ronghua was the concubine of Emperor Wen of Sui, Yang Jian. She was favored after the death of Empress Dugu and was named Madam Ronghua. Madam Xuanhua was originally the younger sister of Emperor Chen Xuan of the Southern and Northern Dynasties. She was later captured and assigned to the Ye Court as a palace maid. Later, she was chosen as the concubine of Emperor Wen of the Sui Dynasty. There were no detailed records of their relationship and subsequent developments in the literature.