Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Yes, if there is pinworm infestation then bugs can appear in the stool. For that, she needs to take the full course of antibiotics, if so then only the condition will be cured. If she still sees those bugs then she can continue those antibiotics for one more time or can change for the better antibiotics. But, if it is left then it will cause anemia and other problems to her. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Archana