LOADING ERROR LOADING Christina Applegate’s teen daughter, Sadie, recently opened up about how her mother’s multiple sclerosis diagnosis has affected her. During an appearance on Thursday’s episode of “MeSsy,” the podcast Applegate co-hosts with fellow actor Jamie-Lynn Sigler, the 13-year-old said that certain things have been “really hard” for her since her mom was diagnosed with MS in 2021. “It …