A character actress given to tasty bit parts, Grace Zabriskie vacillates between erotic exhibitionists and colorful, brassy mothers. Since making her feature debut in "Norma Rae" (1978), the New Orleans-born actress has gone on to leave an indelible mark on both the small and big screens. She has been particularly effective in movies playing mothers, albeit not the kind that would be embraced by June Cleaver. In "An Officer and a Gentleman" (1982), Zabriskie portrayed Debra Winger's mom while in "Drugstore Cowboy" (1989), she was the rejecting parent of Matt Dillon. The actress drew on her