I think it is totally inappropriate for children to go to pop concerts of any sort, what on earth happened to childhood?
You can't be serious. Did you never go to concerts or theatre when you were a kid? My parents took me & my sister quite often, when I was older I went with friends, parents would sometimes take and pick up. I did the same with my kids. Gigs are exciting for young people. I still find them exciting now but not in same way as when I was young.
Meeting different types of people is part of growing up too. There's safety in numbers so going out with a few friends can't be harmful, they look out for eachother.
As for 'Little Mix' looking like prostitutes, what a vile thing to say about a group of nice, well behaved young women, you only have to look at their faces to see that!!! Do you know what a prostitute looks like anyway, they come in all sorts of packages.
Going back to op, the woman had signing for the main act & one would have thought that was enough. I suppose she has a point though. Surprised it made the news. What is nice is her taking her children to the gig and her daughter saying she likes her mum to go with her.