Mental Merit 1 or 3
Wits 3 or Composure 3
Your character has spent years in the field, catching tiny details and digging for secrets. She might not have a better chance of finding things, but she has a better chance of finding important things.
Any time you make a Perception roll (usually Wits + Composure), you benefit from the 9-again quality.
With the three-dot version, you get 8-again.