1) As exciting as snakes are, she wanted a little getaway afterward, and so headed off to Vegas for a couple weeks just to get a change of scenery and have some fun. (This is a thing she does in canon a couple times--she'll up and leave for a while, and then come back later like nothing happened).
2) Both Diamondback and Wicked Grace are card games based on chance, commonly favored by merchants, traders and pirates. Isabela comes from Southern Rivain, which is a major trading hub/hive of scum and villainy and thusly full of traders, merchants and pirates (she even married one of these types) playing said games, and would therefore have learned the games in her youth in this particular area of Thedas just by their sheer ubiquitousness.
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1) As exciting as snakes are, she wanted a little getaway afterward, and so headed off to Vegas for a couple weeks just to get a change of scenery and have some fun. (This is a thing she does in canon a couple times--she'll up and leave for a while, and then come back later like nothing happened).
2) Both Diamondback and Wicked Grace are card games based on chance, commonly favored by merchants, traders and pirates. Isabela comes from Southern Rivain, which is a major trading hub/hive of scum and villainy and thusly full of traders, merchants and pirates (she even married one of these types) playing said games, and would therefore have learned the games in her youth in this particular area of Thedas just by their sheer ubiquitousness.