t's not my intention to move directly to legal action. I'd like to contact her, explain the situation, and ask that she return the money if she's no longer willing to fulfill her side of the bargain. Failing that, I'm hoping that the threat of legal action will be enough to get her to negotiate. That said, I am preparing for the possibility of pursuing legal action because she'd have no reason to negotiate if I was relying on an empty threat. To that end, I'm not interested in discussing the legal aspects of this matter until after it's been resolved; the model may see this at some point and I don't want to tip my hand. The reason that I'm not going after the camsite is related to this, so it will have to wait.
I'm not sure what you want from ACF. Our blessing to track her down or hints on how to do so? I can't/won't provide you with how to track her down. As far as our blessing, why do you care? A $1,000 is a lot to lose, I had a girl quit camming while still owing me $100 for a skype, which was below the threshold for me to waste my time, but enough to be annoyed.
You are being so vague that is really hard to give any informed opinions. If you paid her via a camsite, your first option should be to go through the camsite, and you probably should have done that before the pay period ended, cause there is no way a camsite is going to try and take money retroactively from a model.
If you used some other payment, your second option is to contact whoever you uses to give her the $1,000 Paypal, Snapcash, Amazon gift cards and get them to refund your money. I think it will be an up hill battle, but for $1,000 certainly worth a few hours of your time.
If you want to track her down go for it, whatever rights of privacy she had ended when she took a $1,000 and didn't provide the service she agreed to. But I think you are bit naive to think that she is going automatically hand over the $1,000 just because you send her an email. Honestly, the threats of legal action are a bit hollow. Even if you say sue her in small claims, unless she lives in the same country/state as you good luck collecting.
Finally, this is understandably a pro-model forum, and being stalked by an obsessed member is a big fear of many/most models. If she behaved as you describe, who cares if you scare her. When you rip people off you should be scared of the consequences of your illegal behavior. The caveat on my advice is that I know I've heard at most 1/2 of your side of the story. If everything is exactly how you described then, I'd do it. But if there been behavior on your part which anyway justified her cutting contact with you, then I'd move on.