Annā: how, from where, and when

Interrogation (al-Istifhām): Particles, Conception, Assent and Rhetorical Uses

أَنَّى يُحْيِي هَذِهِ اللَّهُ بَعْدَ مَوْتِهَا
How will Allah revive this after its death? (al-Baqarah 2:259)

Here annā means kayfa, asking about manner.

يَا مَرْيَمُ أَنَّى لَكِ هَذَا
O Maryam, where has this come to you from? (Āl ʿImrān 3:37)

Here annā is equivalent to min ayna, asking about origin.

زُرْ أَنَّى شِئْتَ
Visit whenever you wish.

Here annā can mean matā, relating to time. The correct sense is determined by the sentence and the relevant contextual cues, not by forcing one gloss onto every occurrence.