She hated Zhang Shanshan to death, got in touch with Heizi, gave him a sum of money and some jewelry, and let Heizi go tempt Zhang Shanshan into using drugs, ruining Zhang Shanshan.
Every move she made was under the surveillance of Feng Yushang.
Feng Yushang knew everything she did.
The jewelry was stolen from Feng Yushang's mother.
She lived in the Feng Family's home, and after the death of Feng Yushang's mother, Feng Yushang was so grief-stricken that he became disoriented and listless.
She took the opportunity when Feng Yushang was dealing with his mother's funeral to steal several pieces of his mother's jewelry.
Feng Yushang's mother had plenty of jewelry. With the mother gone and Feng Yushang overwhelmed with grief, he had no energy to care about the jewelry she left behind.
She hid those pieces of jewelry, not even telling Feng Linyu about them.
She hated Zhang Shanshan to death and, to get Wang Pei to harm Zhang Shanshan, she gave those pieces of jewelry to Wang Pei.