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Strikta: Late to the party and can't be bothered reading what's already said but... She's still pretty young and some things she probably got to learn on her own the hard way. Sure you can come with advice and all that shit but some things boil down to experience as well. Have you aired the thought that maybe the stripper lifestyle and stalkers may not be healthy for the kid as well? I'm not saying it puts her or the child in danger but potential dangerous patrons could be a risk in the long run as each time she work she might get introduced to another lunatic. Don't take me wrong, I'm not saying being a stripper is a bad thing to do at all, the skill it takes to pull it off and do well is often forgotten and I commend those that does it within reason as it is with every other occupation.
But I think the main thing here, which you state yourself as well, is the child and your relationship to it. Not just that, but yourself as well. Are you mentally resilient enough to not let it get to you in the long run? How will that affect your role as a parent and as a human being? Will it wear you down and make the situation worse? Is taking a break a possibility with the hopes she sees it in the long run and get back together when the time is right? Is the financial situation so bad that even taking all of these things into consideration it's still worth continuing her job from a neutral and objective standpoint as food, books and field trips need to be accomodated as well? If yes on the last question then maybe waiting it out is the best option, if not the other questions should guide you to the answer of what the best thing to do is for you, her and most importantly: the kid.
Hope you figure it out. Oh, sorry about dropping this on the 25th, didn't really think it through as we celebrate Christmas eve on the 24th over here. I wish you and your family the very best for the future and hope you figure something out. Peace.