“تَرْهَقُ” (tarhaqu)means “Will cover them” in this verse. It is a verb. an action or state word. Here it is imperfect verb, third person — feminine — singular.Corpus grammarV — third person feminine singular imperfect verb.
“هَا” (hā)an attached pronoun meaning “she” or “her.”Corpus grammarPRON — third person feminine singular subject pronoun.