Sound Feminine Plural: Ya Is Present

Ism Manqus: Case, Dual and Sound Plurals

For the sound feminine plural, ya is present and اتٌ is added.

بَاقِيَةٌ → بَاقِيَاتٌ
قَاضِيَةٌ → قَاضِيَاتٌ
هَادِيَةٌ → هَادِيَاتٌ
دَاعِيَةٌ → دَاعِيَاتٌ

Contrast this with the sound masculine plural: هَادُونَ has no ya, but هَادِيَاتٌ retains it. The plural type determines the operation.