Does it matter if she was there or not? Like you say you could have ten directors who were there making a film and nine would be wrong in the eyes of the other going by what you say. It is nigh on impossible to make a film depicting how it actually was today. She did a fantastic job getting the look right but it was never meant to represent any one specific year but simply an era wasn’t it? She also had some extremely in the know consultants, movers and shakers at the time and dancers of the time, from which by all accounts she took her lead. Obviously a bit of artistic licence was going to happen as it does on any movie.
It is all to easy to sit and nit pick on a forum, we didn’t go through what they did to finance it, go to the extraordinary lengths to get it pretty much right and at least give the viewer an idea what it was like, many have said she managed by and large to do that. It was never going to satisfy some and I don’t think it set out to satisfy everyone, it is at the end of the day entertainment.