It is not, in the end, so different from her rifle; figuring for windspeed, distance, gravity. For movement of the target, and imperfections in the material. The calculations will be much different and she has no idea how to do that yet, but the mechanics are the same.

She levels her arm, draws back the arrow, and sets her sight line. She asks, "Do the purple ones explode?" and lets fly at one accordingly not too far away, large enough not to miss, close enough she's sure of that.