https://screenrant.com/georgie-and-mandys-first-marriage-episode-17-missys-worsening-rebellion-reason-explainer/

Missy's behavior gets worse as the Coopers story continues in Georgie & Mandy's First Marriage (https://screenrant.com/db/tv-show/georgie-mandy-s-first-marriage/), but Sheldon's twin also subtly reveals why.