My cousin has just informed me that she's a stripper, what should I do?

If a woman is desperate enough to take off her clothes for money, so be it. There probably isn't much anyone can do, I'm sure she appreciates you trying to help and all but in all reality women like to feel independent no matter how hard that is, some people may look down on strippers. I personally don;t find it degrading whatsoever. All you can do is reassure her that she is loved and cared about, anything else is her own personal decision.