This could be - any of the anorectal problems, including fissures, fistulae, abscesses, or irritation and itching, also called pruritus ani, and hemorrhoids.
'An anal fissure is an unnatural crack or tear in the anus skin. As a fissure, these tiny tears may show as bright red rectal bleeding and cause severe periodic pain after defecation.'
'Symptoms of external hemorrhoids may include painful swelling or a hard lump around the anus that results when a blood clot forms. This condition is known as a thrombosed external hemorrhoid.
In addition, excessive straining, rubbing, or cleaning around the anus may cause irritation with bleeding and/or itching, which may produce a vicious cycle of symptoms. Draining mucus may also cause itching.'
It would be best to consult a surgeon for her symptoms to find out the cause of her complaints.
Let us know if you need any other information. Post us about how she is doing.