I don't know off the top of my head. Maybe check entertainment news websites or the official credits of the show to confirm if Lauren London is part of True Story.
Without more information, it's impossible to say who Lauren is. She could be an ordinary girl, a character in a made - up story, or someone known within a particular group.
In the 'father does know best the lauren chapin story', Lauren Chapin is probably the person whose life and experiences are being told in relation to her father's wisdom. She could be an ordinary person whose story of family dynamics, with her father being the source of great knowledge, is being shared. Without more details, it's difficult to say more about her, but she's clearly an important part of this narrative.
It could be that Bella has a love interest that Lauren also fancies. In fanfiction, love triangles are common. If the object of affection shows more interest in Bella, it would make Lauren jealous. For example, if there's a guy both of them like, and he always chooses Bella over Lauren.
Kenzi would be an important character too. She's Lauren's friend and has a big heart. She'd probably be the one running around trying to get all the necessary supplies or information. She could also be the comic relief in the otherwise tense situation, but still be deeply concerned about Lauren's well - being.
I'm not sure specifically who Lauren Esker is within the context of Fantastic Fiction without more information. There could be many authors or characters named Lauren Esker in the world of Fantastic Fiction.