Why does attacking Hulda give me bounty in The Reach?

While playing Skyrim today, I wanted to get an upgrade for Ysolda. So, I attacked Hulda, but was spotted, and gained 40 bounty in The Reach.

Then I reloaded, and the same happened. Attacking anyone else in the room, before or after, gave bounty in Whiterun as normal.

Is there some connection between Hulda and The Reach — in lore, code, or both — that would explain this behavior?