It's the argument that draws her attention; she's got an ingrained sort of instinct for that type of thing these days, and she's heading over to check it out before she realizes who's involved.

She quickens her pace when she realizes it's Kanaya, catching snippets of the conversation and noting the money in Kanaya's hand by the time she's standing beside both the girl and the vendor.

"Kanaya, hey, hold on a sec," Without even pausing, she fishes her wallet from her pocket and hands over enough bills to cover the cost of the scarf, addressing the vendor with the most charming smile she can muster, "Sorry about that, she's from out of town, hasn't had a chance to have her money exchanged yet."