Lots of filmmakers, but especially documentarians, split their time between commercial gigs that keep the lights on and more personal works. Mary Lambert, whose ladies-of-the-U.S. Senate doc 14 Women had its world premiere last night at SILVERDOCS, is no different. Her resume includes the 1989 Stephen King adaptation Pet Sematary, some TV and direct-to-video stuff with awesome titles like My Stepson, My Lover and and Halloween II: Kalabar’s Revenge, plus music videos for the likes…