Sadly, living in constant fear and anxiety like this has no simple cure. Rescue Remedy, Mimosa bark and Yuan zhi, and if she can find a psychiatrist who works with Psilocybin or Mescaline, it may really help her. For her GI a combination of Hops, Chamomile, Catnip, Meadowsweet and Cyperus may provide a bit of relief. This is a terrible situation can she get any therapy or pastoral counseling to help with her very real fear. (and when the kid comes back a really good lock on her bedroom door)