Hard to say. Without more context or specific information about Lydia Tar, it's difficult to determine if it's a completely true story. It could be based on real events but with some embellishments.
Hard to say. It could have elements drawn from real life, or it could be purely fictional. We might need to do more research or look for official statements from the creator.
Aunt Lydia was likely influenced by the changing social and political environment in the lead - up to Gilead. She may have faced her own hardships or losses that made her more susceptible to the ideas of Gilead. Her past could also include some sort of religious upbringing which is now warped into her role in Gilead. She is a product of the society she lives in, and her back story is one of gradual transformation into the strict enforcer we see in the story.
The story of Styls and Lydia ends on a hopeful note. They overcome many obstacles and build a happy life together. Their love and determination help them through tough times.
Aunt Lydia's back story is that she was probably living in a society that was changing. She got caught up in the Gilead ideology. She likely had some experiences that made her side with the new regime. She now enforces the rules on women, like the Handmaids, and is a symbol of the strict control in Gilead.