When I look at the scene and see the cute sailor girl get shot, it looks like a concussion blast, it probably works like a Shock round, except without the shock. I would guess the girl is rendered unconscious by the concussive wave rather than the impact itself
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Indeed. This may be exactly what happens. When the round hits her it releases a concussive wave. The wave disrupts her brain and CNS. She is quickly knocked out and will be out for a decent amount of time as her body recovers from the shock wave.
The girl does let out a yelp when she is hit so I assume she experiences a bit of pain before she loses consciousness.
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That would be from the impact of the bullet as it does hit her chest with some force. Then the wave shuts down her CNS and she's out like a light. Plenty of time for Najica to strip her, and stash her then complete her mission.