Bullies are desperate and fearful. This person is more afraid of you than you think. I will pray for your situation. Try going in tomorrow and telling her that you prayed for her, if she ask why or says she doesn't need your prayers, tell her that you understand and that it was on your heart to pray for her. If that doesn't work you are going to have to fight fire with fire and stand up to her. Bullies usually back down when confronted. No job is worth getting sick over and you need to put your feelings in writing to the head manager.