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You need to stop her by all means, she's a woman and eventually get married one day and it's not going to help her at her husbands house and believe me no man would want to keep a gambler as a wife despite the love they may both have for each other but it won't help matters, and again you might be lucky and it might kind of favor you but note all don't have same grace, if gambling favors you it might wreck her, and again she's a woman, just stop her it's not good for her, I will definitely affect her future if she should get addicted to it.
Regardless of gender, gambling can make anyone addicted. It's quite uncommon for women to gamble in my country, the majority of gamblers are men. However, in other countries, female gambling is quite common and they can gamble at their own discretion (if they are of legal age), but parental supervision is required if they are underage. The casino's terms and services also state that any of their potential customers must be 18 years of age or older, otherwise they will not be allowed to register.
The OP needs to increase supervision of her daughter if she truly doesn't want her to become a bad gambler. He shouldn't let her gamble as she pleases, regardless of the game. Of course, the negative consequences should be considered, rather than leaving her unsupervised.
That's why he is asking for advice on whether to allow his daughter to continue gambling or to cut her off from it. I read your replies, and now I feel the same way and advise the OP to cut her off, as gambling does not suit women. However, I later learned that there are more female gamblers, like Judy Bayley, who is known as the first gambling lady. So now I think if she gets married and becomes dependent on her husband, and later on, he does not earn enough or is not fulfilling her needs, at least she will have some skills and knowledge of gambling that she can utilize for daily expenses until she can get a better job. For this reason, I suggest giving her the knowledge and allowing her to practice, but never take your eyes off her activities until she can manage the bankroll and emotions.