Hi there and welcome. Thread worms can not be in the vagina. They are found in the intestinal tract. So, it's not thread worms.
Perhaps she needs to see a doctor to examine her and give advice. That would be my recommendation. She could have an overgrowth of yeast in which either a topical, OTC product can be used or a systemic pill prescribed by her doctor. But I would think she should be seen at this point. good luck
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