I work for a university that offers Physics and I agree with many of the comments above. Four A-levels is unnecessary, especially if it dilutes the grades of Physics and Maths, so unless she is adamant she wants all four I would agree drop Biology.
Some lower ranked universities will be more flexible and take into account overall UCAS points whereas some of the most famous Physics departments will specify things A A A, so a fourth A-level doesn't actually help her there.
Maths is just as important at degree level, it's a big step up and if students can't keep up with the Maths she will have a miserable time and possibly drop out.
She needs to be really honest with herself about the Maths - is this something she wants to explore at degree level and possibly a core part of her career? (If she stays in Physics).
Universities are gearing up for their post-application Open/Visit days, these are the standard Open Days are the best opportunity to talk to universities to understand what the course and assessment is like, but also what makes their courses different from each other, what research and industry links they have, and types of jobs graduates go onto.
I'd advise that she doesn't need to have her whole career mapped out, but if there are topics, research areas or careers out there that inspire her she's on the right path!
But it's definitely worth looking at degrees in Engineering or fields of Geography where the Maths and Physics could be invaluable. Environmental science and environmental engineering are getting a lot of attention these days.
Good luck!