It sounds like the conversation Madara described was with Kaylee Simmons, in February of 2017 before Kaylee could have met Mandi.
Kaylee was sexually abused as a child, and is used to playing the role of a victim, of a child. Mandi played the mother, telling me Kaylee had a hard life and needed a break on her sentence. Mandi tried to get me to send money to feed Kaylee's sister's kids.
Madara said the person who cried on her lap and confessed was "Kaylee" multiple times at Mandi's trial, despite Madara previously claiming she and Kaylee never met.
At Madara's deposition, Madara quoted the girl in her confession as saying "I'm only 19 years old. I have my whole life ahead of me and I have this now."
On September 21, 2016, when Kaylee was arrested, she was 19. When Kaylee supposedly met Madara right before Madara sent her letter to the prosecutor, Kaylee had just turned 20 a few days earlier, and Mandi had been 21 for 9 months. At Mandi's trial, Kaylee said "I've been my whole life in here." Though like many things, it is not in the transcript. It was around when she said "actually growing up, because, you know, I never got that chance. I never had an ID or anything." For contrast, Mandi never mentioned any concept of a future life different from and better than the present. Mandi thought she was always an adult.