Rose casts a spell to make herself invisible when the man advises they usually get ambushed in that area, and gets ready to climb out of the cart. When it stops, she climbs out and goes over to one of the thugs, drawing her sabre and striking him.
Spoiler: Actions
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Casting invisibility

Stealth to get ear one of the thugs (ideally the one that looks like he's in charge): (1d20+31)[32]

Attack: (1d20+5)[10]/(1d20+5)[19]
Damage: (1d8+1)[6]/(2d8+2)[11]
Sneak Attack: (3d6)[8]