I'm not meaning this in a horrible way at all emkana, but if your DD's choosing not to play with each of the DC for different reasons, then the 'problem' lies with your DD and not the other children.
Of course they should play nicely and inclusively, but to be part of a group your DD does have to adapt to what they're doing/talking about a bit, or she will find herself out on a limb.
DD's not interested in a lot of the crap they talk about at her school either x-factor/celebs/footy and has different interests (mostly Jaqueline Wilson), but that's not the other DCs fault, if DD doesn't want to be walking around on her own she has to find something in common with the others. (BTW, if she does find herself knocking about on her own, she just reads a book at playtime, apparently quite a few do it, all sat on a wall
how things have changed since my day
).
Also, and I do it as well so I'm not judging, you say you wouldn't know who to pick as they all sound nightmareish, perhaps you could try to teach her to think differently about the other DC? Looking at why they're behaving like that, or looking for positive points about them?
There's no easy answers though, I hate having to see DD having to go though the torture that school can be sometimes, but they are learning important things about how the shitty world works when they get to be an adult and how to make the best of themselves in it.