يَصْلَاهَا

يَصْلَاهَا 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
He burn itيَصْلَاهَا=هَا+مُسْتَتِرٌ تَقْدِيْرُهُ هُوَ+يَصْلَى
He will burn in itit(He)burn
Surah/Below are the 2 verses in the holy Quran containing the verb and third person, feminine, singular objectيَصْلَاهَا
Verse
17-8
92-15not will it burn except the most wretchedلَا يَصْلَاهَآ إِلَّا الأَشْقَى