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If the blood is present on wiping only, then it can come from the anal margin.
It can come from trauma from wiping.
Repeated bowel motion & wiping can make the area sore.
It is not worrying.
However, if there is blood in stool, it can occur from from a bacterial or parasitic infection.
Antibiotic can be required then.
An examination by doctor, stool test would be required.
I hope this information will be helpful.
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Wish her healthy life.