I have found no evidence that pinworms can use the blood stream for any part of their lifecycle. Their entire life uses the gastro-intestinal tract from the mouth to the anal opening. Treatment is straightforward and I imagine that she has been given some medicine? The rest of the family should be treated too.
There is no possibility that pinworms would impact on the PDA site. I hope you can be reassured by that.
Does this answer your question? Has she been showing any symptoms/murmurs that are causing you any concern?
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