After mistaking a Long Island Iced Tea for a "tea from New York", Holly is pulled away from the Blackjack table by the other Army wives while one collects the chips. As Holly is pulled away from the table, she grabs her "tea". After the camera switches views, the glass is shown still sitting on the table.
The last time Latasha rolls the dice, the one further away from the camera spins around and it is obvious that there are 5 pips on multiple sides.
In prior episodes, it was established that Holly is under 21. She's 18. She's not old enough to gamble in a casino. The minimum age to gable in a casino in the U.S. is 21. It doesn't matter if she's only played Blackjack with one deck instead of three if she can't get in.