If the subject is genuinely feminine but a word separates it from the verb, the book allows either masculine or feminine agreement. In «ضَرَبَ الْيَوْمَ هِنْدٌ», «الْيَوْمَ» separates the verb and subject; «ضَرَبَتِ الْيَوْمَ هِنْدٌ» is also allowed. Without separation, as in «قَامَتْ هِنْدٌ», feminine agreement is obligatory.
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How Separation Changes the Rule
Rules of the Fāʿil: Explicit Nouns, Pronouns, Number and Gender
If the subject is genuinely feminine but a word separates it from the verb, the book allows either masculine or feminine agreement. In «ضَرَبَ الْيَوْمَ هِنْدٌ», «الْيَوْمَ» separates the verb and subject; «ضَرَبَتِ الْيَوْمَ هِنْدٌ» is also allowed. Without separation, as in «قَامَتْ هِنْدٌ», feminine agreement is obligatory.