طَحَاهَا

طَحَاهَا is a verbal sentence  (الجُمْلَةُ الفِعْلِيَّةُ) consisting of a verb and an object in the form of a third-person, feminine, singular attached pronoun

فِعْلٌ وَمَفْعُوْلٌ بِهِمَفْعُوْلٌ بِهِ فَاعِلٌ فِعْلٌ
Verbal sentenceObject SubjectVerb
الجُمْلَةُ الفِعْلِيَّةُAttached pronounDetached pronoun
AccusativeNominative
Spread itطَحَاهَا=هَا+مُسْتَتِرٌ تَقْدِيْرُهُ هُوَ+طَحَا
He spread itit(He)spread
Surah/Below is the only verse in the holy Quran containing the verb and third person, feminine, singular objectطَحَاهَا
Verse
91-6and the earth and (He) who spread itوَالأَرْضِ وَمَا طَحَاهَا