Olga Ulfstig is an NPC standing in front of Swift, a little ways from the Midway Village fountain. However, when spoken to, she maintains a conversation with the player instead of Swift. She also participates in the player's conversation's with Swift during the Mindless Violins quest.
"It seems I've built a reputation. I hear in one town they call me The Mare with No name. I must have forgotten to introduce myself."