Well, I'm afraid I don't know any of those colleges, but I have this to say: as long as her daughter is happy there, the college offers the right courses, the teachers turn up to lessons (and the pupils do too), that sort of thing, it'll be fine. In the end, all colleges are trying to do the same thing. Go and look round a few, and see what their equipment is like, or their teaching staff, if you need peace of mind. But in the end, the most important thing is that she's happy being at this college.
I notice some of those colleges are very far apart. Manchester and Portsmouth?! She's not seriously considering moving house, is she? Unless you live in some sort of barren wasteland, there'll be a decent enough college or sixth form nearby, and there really is no need to move house. Particularly if you want to avoid disrupting your life. What kind of sensible work ethic does moving 300 miles across the country to go to school create? Granted, she'll end up doing that when she goes to university, but everyone's in the same boat and it's a lot less hassle. Having to move to an entirely new area, make completely new friends, get home to a house full of unpacked boxes for two months, not know where anything is and not be able to get back to where she used to live to see her old friends can all be very stressful, and it's really not recommended. If you're gonna move far, be careful about how far. She might want to get back and see her friends, or be able to get easily into the same town/city centre she's always known. It doesn't sound like a lot, but learning your way round a new town can be very disruptive for a month or two. But then, of course, if she's happy about moving, that's fine... just try and give yourselves enough time to get settled in, get to know the place and have a few days' rest before term starts. A week or two before term starts is fine.
It doesn't matter where she goes to college, as long as the college isn't absolute rubbish. People get in to universities all over the country from all sorts of colleges, schools and sixth forms. As long as they won't stop her doing her subjects of choice or applying to where she wants to apply for whatever she wants to apply for, then it's fine. Other things you might want to consider are: how are the extra-curricular facilities, such as for sport? Are there any school clubs she'd be interested in? Is she a desperate volleyball fanatic, and are you accidentally destroying this hobby of hers by moving to a place where no one plays it? Do the pupils in the school generally have a responsive attitude towards work? In a nutshell: which college would she feel most comfortable and happiest going to for two years of her life?