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.
I'm not sure exactly who Michelle Brown is without reading the story in detail. But she is likely the victim of identity theft in this particular account.
I'm pretty sure there isn't a Michelle in the Spiderman comics. The comic characters are pretty well-defined, and Michelle isn't one of them. But you never know, there could be a new character introduced in future issues.
Michelle Brown is the victim of identity theft in this story. She is the central figure whose experience with having her identity stolen is being told.
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.
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.