can I second the message about not even relying totally on the universities, at least as far as their websites go. When we talked to admission tutors at open days the messages they gave out were often slightly different to the websites. Having said that if they give an IB requirement on the website and she exceeds it she'll pass that part of the computer sift. She then needs to pass their UKCAT or BMAT sift if they have one, the personal statement sift and then, hopefully the interview. If some of her marks come from the essay she needs to check with each medical school whether they will be counted, unfortunately that isn't on the student room website. If at all possible she should attend open days and ask questions, if not check the student room threads and ring/e-mail admission tutors.
I think I remember you saying she was also doing an A level? If so you need to check with schools whether they will give any additional credit for that, especially if she gets an A/A*. It probably wont be counted in any computer sift but if she exceeds their IB cutoff and has additional qualifications its something to bring out in the personal statement/reference. Cambridge say they use the BMAT partly to level the playing field for A level and IB students. Oxford and Cambridge might be more likely to give credit for extra qualifications.
Barts are normally very stuffy about meeting their requirements. If she doesn't have exactly what they specify best not to apply.
Cardiff were rather a disaster this year over interviews but hopefully will be more organised in the next round. It's a friendly medical school (when we stopped to look at a map someone always stopped and offered help) and likes a lot of good GSCE grades. It might be worth a look. East Anglia has a bit of a reputation for liking reapplicants but they are also hot on work experience, has she managed to do anything extra this year?
Last year some medical schools apparently offered places in August to people they had previously rejected without interview. At least one person on the student room claimed to have an offer from an interview in August. With the exception of Cambridge she could consider phoning her other choices on A level day to see if they have any medicine vacancies. She could even try a cheeky phone call to one or two of the other medical schools, especially those that made a bit of a mess of the process this year.
She could see if there are places in clearing for courses that allow a few students to transfer to medicine e.g. Newcastle Biomedical, couple of courses at Bradford, St Georges, possibly others. Other options are Malta (need a language at AS equivalent, can be English) and other European medical schools that teach initially in English. She would need to learn the local language before the clinical years.