لِّسَعْيِهَا رَاضِيَةٌۭ
Sentence structure
لِّسَعْيِهَا is a prepositional phrase linked to رَاضِيَةٌ, which continues the description of the faces. Attached هَا is a genitive possessor.
Ayah summary
They will rejoice at the good outcome of their righteous effort.
لِّسَعْيِهَا — With their effort
Grammar: لِ is a preposition, سَعْيِ its genitive noun, and attached هَا a third-person feminine-singular possessor. This phrase is linked to «رَاضِيَةٌ».
رَاضِيَةٌۭ — satisfied
Grammar: An indefinite feminine-singular nominative active participle continuing the predicate/description of the faces.