The issue here is not merely that Kanga managed to evade overworked and overstretched staff. I do get that this will happen if the teen is determined enouGh. But here - THEY KNEW, AND FAILED TO REPORT IT TO YOU.
You have problems at several levels. Whether or not it is unrealistic of you to expect them to keep Kanga's chastity belt on - I can't say. On that matter, however, I would examine every bit of their advertising as well as any agreements you have with them, verbal or written, as to exactly what service they promised to provide. I do feel it is wrong to expect too much of them, if they are not really able to 100% prevent Kanga having sex. But if they said that their brief would be to properly supervise her to ensure she had no access to the opposite sex, as well as work with her to help her learn to control her own urges, then they are failing there. Now, they could be failing because they didn't realise hat they were getting into. But if that is the case, there should be some sort of realisation of this, not denial.
The biggest problem as I see it, is that you are finding out from Kanga, that she got caught again. The staff member who caught her should not be in trouble, because she didn't squeal to you. All she did was her job, and possibly not even that to the full extent, if you were not told.
I strongly suspect they either did not tell you because they knew you would be angry with them and they didn't want to give you any more ammunition, or they didn't really think it was important enough. In fact I wonder if they privately think she shouldn't be in Residential Treatment Center (RTC), she's only there because she's wanting to be sexually active and you're a prude who needs to let your daughter do what comes naturally. I don't know how much of Kanga's other issues, they might be blaming purely on parental repression. Which of course indicates even more, that you have to get her transferred to somewhere with tighter security, a more serious approach to these matters and at the same time, you need to kick rear ends as high up as you can reach them. High kicks.
With Kanga's determination to have sex, I do think you need to at some level accept (if you haven't already) that she is increasingly skilled at defeating whatever an Residential Treatment Center (RTC) can put in place, and you need to be outwardly understanding of this, in the new place, so they won't be afraid to tell you WHEN they begin to discover that the amount of supervision they thought was needed suddenly is shown to be woefully inadequate. It may be possible that Kanga's determination will defeat any Residential Treatment Center (RTC)'s supervision. But I do agree - they need to at least be trying.
One scary thought- Kanga told you because she knew she had been caught and probably assumed you had been told. How many times has she not been discovered, and not told you?
And an even scarier thought, to echo Linda's - how and when is anybody going to get through to her, so she can begin to work on her own issues? Currently she is making less than zero effort and it doesn't augur well for her future.
I would have thought that staff at Residential Treatment Center (RTC) have certain standards of best practice to maintain. Surely there is a professional body they have to report to, or meet the standards of? If one exists, I would definitely be reporting this mob to them as well.
Marg