Phase 1: Long-Range Engagement
Sniper Wolf is a master marksman. You'll need the PSG1 Sniper Rifle (found in the Armory on B2 of the Nuclear Warhead Storage Building) to counter her. Find a good vantage point in the snowfield, preferably behind cover. Equip your PSG1 and use its scope to locate her. She will move between several positions. Aim for headshots for maximum damage. Use Diazepam (found in the same area as the PSG1) to steady your aim. If she hits you, quickly use a Ration to recover. This is a test of patience and precision. Don't rush your shots.
Phase 2: Retreat and Re-engage
There isn't a distinct second phase, but as her health depletes, she will become more evasive and her shots might become more frequent. Continue to use Diazepam and aim for headshots. If you run low on ammo, there are some PSG1 rounds scattered around the snowfield, but collecting them can be risky. Stay calm and focused. Reward: Access to Communications Tower A.