Hemlock has no illusions about her chances in a fair fight, and will just be trying to stay out of it. As soon as the Arena starts, she'll bolt, and will probably end up in either the forest or the mountains, looking for somewhere to climb and get hidden out of the way.

In general, she'll be keeping up evasive tactics, maybe setting up traps. She's unlikely to approach anyone, and will generally be pretty wary of anyone she doesn't know (so... anyone), but if you're armed when you approach her, she might play nice.

She's no good at fighting, but she's sharp and resourceful, so if you can manage to get her to trust you, or at least to play nice until she can escape or kill you, she's an asset in that way. Takers?