Explanation
She asked how she, a girl, who could not ride or use sword or lance, could be of any help. Rather would she stay at home and spin beside her dear mother.
The reporting verb "said" changes to "asked" to match the question format in indirect speech.
Tenses are correctly shifted from present to past ("can" → "could", "cannot" → "could not").
The rest of the sentence maintains the original meaning and structure.