Ḍaraba Zaydun has a masculine subject. Ḍarabat Hindun has a feminine subject, so the past verb carries the feminine tāʾ.
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Masculine versus Feminine Form
Feminine Tāʾ in the Past Tense: Form and Agreement
Ḍaraba Zaydun has a masculine subject. Ḍarabat Hindun has a feminine subject, so the past verb carries the feminine tāʾ.