OOC:
You did so well already that you likely don't need the extra dice, but I would suggest that the "extra boost" and "extra setback" of empowered and diminish should probably both get applied on opposed checks, especially since I'm trying to make the rolls as player-facing as possible. In other words, if you're rolling Stealth versus Vigilance, that's a player-facing roll and would by RAW get the boost, but there's no setback since the enemy isn't actively rolling. But I'm cool with saying that the enemy setback should probably flip over to become a boost to you, as well. So I'll roll those to Perception roll. (Not the Stealth checks, as you wouldn't need to get to short range of the guards to sneak by.)
Oh, wait, but thanks for reminding me about the one-turn thing for the Heroic Ability. I had already written my post when I read your addendum, so take this GM freebie! :) It's not a bad thing that y'all know the mayor and the weaver aren't exactly buddy-buddy.
Child's play. Nera slips past the mayor's house guards with no trouble at all, finding them sitting on the front steps chatting mindlessly. It's a simple enough matter to just pad along behind the house and then slip right back to the center of town by the path she just came in on. In fact, the familiarity saves Nera a good amount of time she might otherwise have spent wandering around.
With the moon hidden behind clouds, Nera glides through the darkness in the village square. Flickering candlelight spill from the slats in the weaver's shutters. As she nears the cottage, Nera notices the guards there have erected one of those buzzard dolls, but they haven't lit it yet. Maybe they're waiting on permission from the mayor?
At the cottage, the Catfolk slinks under the wooden slats in the fence and then over to the side of the house. She flattens herself against the wall for a moment to make sure the guards (or the weaver) haven't noticed her approach.
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This seems like something the others should know. Nera slips back under the fence and heads back toward the mayor's manor. As she nears the bridge near the festival area, she can see torchlight moving her way, so she quickly returns to the back door and slips back into the manor.