أَشْقَاهَا

أَشْقَاهَا is a phrase (شِبْهُ الجُمْلَةِ) consisting of a possessed noun and a possessive noun compound

PhraseNoun / NounNoun Noun
شِبْهُ الجُمْلَةِمُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِمُضَافٌ
PhrasePossessive compoundPossessive noun/ownerNoun possessed/owned
their worstأَشْقَاهَا=هَا+أَشْقَا
the most wretched of theirstheirsthe most wretched of
Surah/Below is the only verse in the holy Quran containing the possessive nominal compound أَشْقَاهَا
Verse
91-12when the most wretched among them went forthإِذِ انْبَعَثَ أَشْقَاهَا