LOS ANGELES (AP) — Danielle Spencer, who played the wisecracking and tattling little sister Dee Thomas on the 1970s sitcom “What’s Happening!!” has died at 60.Spencer, who became a veterinarian later in life, died Monday at a hospital in Richmond, Virginia, after a yearslong battle with cancer, family spokesperson Sandra Jones said.As Dee, Spencer was the smarter, more serious younger