The incident happened on Friday as both women began arguing in a blackjack pit. Authorities say the victim was taken to the hospital with deep facial cuts. Her condition was unknown. Police could not confirm whether the two dealers were working at the time of the fight.
The alleged attacker was booked into jail on charges of battery with a deadly weapon and mayhem with substantial bodily harm.
The incident came a week after an Illinois man shot and killed an ex-girlfriend in the lobby of the Excalibur Hotel, then turned the gun on himself.
The Associated Press contributed to this report.