Thanks to those that have stuck up for me 
I'm in a calmer more rational mood this afternoon, dd1 is out shopping but has rang me to say she decided against the leggings after all so no idea what she is coming home with instead but I do trust her so we shall see........
The sleepover I'm fine about, the girls parents are lovely, I've met them quite a few times and I totally trust them to make sure she is ok and the friend she is staying with is a nice girl too so no problems with that.
The shoes.....still not keen but she takes after me in the height department so I can understand her wanting to appear taller to fit in with her friends.
Yes yes yes to the poster who said
I think your have to leave her to it and concentrate on ensuring she is sensible at the party.
No getting drunk (I would be totally hypothetical to say no alcohol, because by 14/15 and may be younger our local dances and some pubs served us).
Boys may be kissed, nothing more. (this never had to be a rule in my pre aids, pre condom machine days, but things have changed).
But most importantly of all, you are where you say you are, when you say you are. You only accept transport off agreed, sober adults your parents have agreed to.
You stay at the house you agreed to stay at. You are polite and respectful to parents you stay with or are given lifts by.
Dd1 was grounded for a couple of days at the start of the week for not being where she was supposed to be and not being contactable by phone, I do not pay for her to have a phone that doesn't work
she's learnt her lesson and I have to give her another chance to prove herself to us.
I was a nightmare teen so I know how much worse it could be and am therefore very grateful for how sensible dd is........