How do you deal with a friend who keeps on asking for financial help?

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I have a friend whom I had lost contact with a couple of years ago. Her own choice, not mine. She married a guy who has lots of vices (drugs is one of them) and a jobless one at that. Bottomline, she is in so much debt and was fired from her job. Just recently, she contacted me, exchange pleasantries and told me what is happening with her life the past couple of years. I was happy that she had contacted me because we were really close along with other friends during college years. And then she told me that she needed my help. She needed financial help because she is all hard up and her family is barely surviving. I was so touched that I sent her money a few times. And then I found out from my bestfriend that she too was contacted and had given money. We contacted other friends and they did the same. We didn't know this until recently because this friend who asked for help made us promised not to tell anybody because she was so embarrased by her situation. We were kind of apprehensive already because she told the same story to everybody and all had gave money to her. We were just worried because her husband might be behind this to finance his vice. Yesterday, I received an email and text from this friend, asking for additional help. Now I am in a dilemma because I do pity her but it seems asking for money is already a habit. She keeps on telling me how lucky I am and woo is her. If you are on this situation, would you still help her out everytime she ask? Or will you just say that you can't help anymore? Any comments is appreciated because it would help me weigh in how to handle this situation without harming our friendship or being branded as selfish.