FAB - that sounds a little odd. I have been treated by several chiropractors over the years as has my DD, and not come across that. Chiro tends to be mechanical manipulation of joints, and strong massgae of muscles to ease them off. They also sometimes use wedges under parts of your body, plus a clucky machine to manipulate joints. I agree that quite often you feel worse after chiro than before, but after a day or so, you really reap the benefits. It would be odd if your DD felt no change after a treatment, if your choro was good and there was a problem to correct - btw they should give you some sort of diagnosis after initial treatment, plus some info about it to take away...
What you are describing sounds more like Reiki - which is most definitekly woo. A propertly acredited chiro will have studied four years at uni to get qualified - it is a proper qualification, and the NHS do refer to them. I personally found chiro much more effective than either physio or osteo.
However, I do wonder about these symptoms your daughter is getting. I know you are worried, but from reading your posts on here, it does sound more like attention seeking than a medical problem. The symptoms seem to vary. They seem to get worse when she is going to bed (ie not with you), at grandparents (not with you), but haven't really stopped her doing the things she really enjoys (ie ballet show). They move about - headaches, side pain, leg pain, and although your DD is still little and articulating pain is tricky, it does sounds all rather vague. She also seems to have more pain when you ask her about it than during the day when she is busy getting on with stuff.
I know you've been having problems with your eldest being bullied, which must be taking up your time and energy, plus you have your own stuff going on. It wouldn't be unusual for your DD to want to have more of your attention, and as she has a history of a medical condition when she was younger, then maybe she has found that exaggerating minor aches and pains is a way to get more of you? That doesn't make her a bad person, just someone who wants her mum! We all get aches and pains now and then, maybe she is just making more of them because she knows that mummy will respond?
This isn't a criticism, but the impression that I get from reading your posts on here. For youir DD to have had so many qualified people look at her and do tests, and there to be no consensus at all about what the problem(s) is/are, is odd (and I am not discounting the rare but scary cases where conditions have been missed). It is suggestive to me that your DD's physical problems may not actually be what all this is about.
Take care