That's to tell you how well women are now involving in gambling and as time passes there's a tendency for more women to indulge in it as well, since the social media have made gambling more popular and the fact that it involves sporting activities makes that more possible.
The major reason why it's rare to find women gambling is because of religious beliefs and societal practices. Women found gambling are said to be irresponsible and aren't meant to be wife's. The society might discriminate them and avoid them in so many socal gatherings. But then things have changed in the past years gambling is not longer a thing you have to do in the public as we now have online gambling platforms. You can gamble from any where without even letting outsiders know you gamble. The rate at which women move into gambling would have increased due to such reasons compared to the past.