Damn, sorry that happened to you mate, and thanks for the warning.
So many red flags! Ad shows multiple hits on Google Images. Reputable providers almost never show their faces (the ones who do most likely would have reviews.) No reviews anywhere. Never send a deposit to non-reputable providers. Always think about the reasons; in this case: Why would sending another 100 speed up the process? How or why does completing the payment enhances her safety? It doesn't make a lot a lot sense. You've already given her 100. Worst-case scenario for her, it's a prank; well she's been paid for her troubles (but why would you pay someone 100 for a prank?) And finally, outcalls with unknown providers? Yikes! You should consider yourself lucky it was only your money; I've heard some pretty terrible stories for cases like that. Think about it: they have your address and you have no idea who's coming!
Be safe and better luck next time.