Every time anyone says her name, it sounds like Dolly Parton. Dolly is played by Whitney Blake, who has a sharp edge and is a vicious cat to Marshal Dillon.
She and her boyfriend, a card dealer played by Mark Miller (the lead actor in the TV series Please Don't Eat the Daisies) have some kind of scam going where Dolly gets card players to cut her into their winnings in exchange for the good luck she brings them because her boyfriend is cheating to let her marks win.
What did not make sense is if the house (Miller) is losing, and Dolly is getting a cut of the profits from individual gamblers (as high as 50%), at the end of the night, Miller & Dolly are still losing 50% or more. It seems like there would be less craziness and more profit if Miller just cheated so he wins instead of cheating so that other gamblers win.
The core of the story is that because Dolly is giving gamblers the illusion that she will bring them luck in exchange for a cut of their profits, the various gamblers get jealous of each other and end up in gun-fights.
At that point Matt Dillon gets involved, and he tries to get Dolly to move out of town, but she is feisty and cuts the Marshall down to size and Dillon has no clue on what to do. She is a tough cookie.
The story goes flat when Dillon focuses on Miller, the weak link. Miller the tough gambler crumbles like a stale cookie in seconds. It does not make any sense that a cream-puff like Miller could be the love interest of a tigress like Dolly.