Garter Colt (1968)

At the border with Mexico, a brave young woman defends herself from the attack of the fearsome bandit, "Red", mastering a gun and the game of poker. Falling in love with a young Frenchman, he asks her to give up gambling and start a quiet and normal life, but when the young man is killed by "Red", she is determined to seek revenge. Source: SWDB http://www.spaghetti-western.net