Has your DD actually been to visit any of her choices yet? What strikes me is how different they all are. So, if the courses really are very similar, what might swing it one way or another is what sort of university experience she wants. What I mean is:
Royal Holloway - campus, in a very small town that, while nice, isn't exactly a social hotspot
Nottingham - campus, in a big city
Queen Mary's - non campus, London
Surrey - campus, in a decent sized but not massive town
They will all have very, very different atmospheres and opportunities.
I did actually go and visit RH, Notts and a couple of the other London colleges when I was applying, and it massively struck me how isolated RH felt (as lovely as the campus was), and also how disconnected the London ones felt - the social side and student housing was (back then, might be different now) combined University of London rather than uni specific, so there was less of an identity.
It might be very different now, and perhaps me initial impressions were not accurate - but I thought I would share the experience so you're prepared that the 'feeling' of the place might be really key.
As it happens, the uni I chose as my first choice wasn't even on my 'maybe' list to start with. I went to visit because my best friend wanted to go and it meant a day off school. She hated it, but I absolutely fell in love with it. So, if you have the opportunity to visit, go to as many as you can, as it will really help you to be more sure of your choices.