Her storylines have included running over her father Max Branning (Jake Wood), alcoholism, supporting her mother Tanya Branning (Jo Joyner) through cervical cancer, her friendships with Lucy Beale (Melissa Suffield/Hetti Bywater) and Whitney Dean (Shona Mc Garty), a relationship with her cousin Joey Branning (David Witts), an affair with a married alcoholic Jake Stone (Jamie Lomas), engagement to Peter Beale (Ben Hardy), struggling to deal with Lucy's murder, giving birth to Peter's son Louie, a relationship with Steven Beale (Aaron Sidwell) following the ending of her relationship with Peter, becoming attracted to Max's boss Josh Hemmings (Eddie Eyre) who also becomes her own boss, having an abortion after becoming pregnant by Steven, dealing with his death, finding out her sister Abi is pregnant by Steven after an affair, working against Weylands plans for development on Albert Square, falling from the Queen Victoria roof alongside Abi, and dealing with Abi's death following the fall.The eldest child and daughter of Max Branning (Jake Wood) and Tanya Branning (Jo Joyner), Lauren moves to Walford with her parents and younger sister, Abi Branning (Lorna Fitzgerald) in July 2006.
Lauren leaves Walford when the extent of Max's debt is revealed by bailiffs who remove the family's possessions.
She returns briefly at Christmas, and dumps Peter again before seeing him kiss Zsa Zsa Carter (Emer Kenny), causing a catfight between her, Zsa Zsa and Whitney.
However, the relationship is threatened when Tanya finds out and the relationship ends when he flees after killing Rob Grayson (Jody Latham), who had been sexually exploiting Whitney for financial gain.
Lauren discovers that Max and Tanya are having an affair, despite Tanya now being married to Greg Jessop (Stefan Booth), Lauren threatens to kill Max unless the affair ends, but it secretly continues.
Romantically involved with Peter Beale (Thomas Law), Max disapproves of their relationship and demands Peter end the romance but ends up throttling him when they meet secretly in the cafe.
Shortly after, Max is left comatose, following a hit-and-run.It is revealed that Lauren is responsible but Tanya confesses to the crime and is imprisoned, pleading guilty to attempted murder.This distresses Lauren who confesses to the police and is found guilty of GBH with intent, and is sentenced to two years under supervision.In 2008, paedophile Tony King (Chris Coghill), stepfather to her best friend, Whitney Dean (Shona Mc Garty), starts grooming her to replace Whitney.When Tony's paedophilia is revealed, Lauren is shocked to learn about his intentions.In August 2014, Jossa announced that she was expecting her first child.