How Chicago Cubs’ Justin Steele and his fiancee, Libby, are dealing with her debilitating illness during a breakout season

CHICAGO — Libby Murphy figured the constant extreme exhaustion she experienced was part of being a new mom. Spring training was underway, about seven months after the birth of her son, Beau, who shares a July birthday with his dad and Murphy’s fiance, Chicago Cubs left-hander Justin Steele. Usually active, Murphy felt especially fatigued and even nauseous after workouts. Something seemed off. …