Zeela is one of Lamalha's amazon assassins, along with Telka and Maneira, that attack the party in the northern part of the map in Area East of Carnival. If entering the area from the north, then the assassins will challenge the player immediately upon entering the zone.

In Baldur's Gate: Enhanced Edition Zeela drops the Harrower, a Long Sword +1 that acts as a Long Sword +3 vs. undead. Little Amazons NPCs
Lamalha and her "little amazons"