Who is Lisa McPherson from Inside Scientology: The Story of America's Most Secretive Religion and what is their importance?

Lisa McPherson was a housewife with a broken past who joined Scientology in 1982. After a troubled childhood and a violent marriage, McPherson was relieved to have a positive purpose in her life. Over time, she became more involved in the church, as was an astounding worker who was extremely successful. But a series of issues led to her being extremely in debt, and on her own. She struggled to maintain herself, and eventually worked her way back to the top, but a series of bad relationships led her again to depression. After going through an intensive auditing, McPherson appeared to be better, but relapsed while at a convention, seeming to have a break with reality.