She is dicing with two halflings, by their dress and speech you judge them to be sailors from the Crosscroft Isles. They look enough to alike to be cousins if not brothers. The one who seems to be doing all the winning isn't doing anything you can identify as cheating. They are playing straight up craps with Peg Leg Pelicanous' dice. The other halfling is losing too, but he doesn't seem to be as unhappy about it as would be expected...