I can tell you what 'tactics' he taught her, and they're not tactics. He simply gouged her eyes out and replaced them with the hive eyes you see. That way they would look at her in the shadows and see her as one of their own. It was the only way she could survive. I'm still kinda curious what she ate, but I'm really not /that/ curious, cuz I kinda suspect. BLECK!!!!
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She was the one who actually replaced her eyes. There's some flavor text or dialogue saying, "They took one eye, so I took three," Either way, she had to have learned something from him, or else the Hive probably would have detected her Light