For lice/mites check around her vent and her head. I would think you could see them, or see droppings or eggs. I would just wait to worm with an actual wormer. Don't you just wish they could talk and tell you what's wrong? So hard to trouble shoot. I would be hesitant to just start dousing her in chemicals without really knowing what's wrong, she's already very weak and wormers/chemical dusts, antibiotics etc. are all hard on them.