OP, A levels dont suit everyone. DD has extremely slow processing speeds, and despite extra time will perform very badly on some sorts of tests. (CATs, Grammar 11+, UKCAT.) At 11 her prep school head, based on her CAT score suggested she would not cope in any selective London day school and that she would need to board.
As it turned out she is quite a gifted mathematician/scientist with an impressive abilty to remember what she was taught in class, and this carried her through GCSEs and A Levels. However for a long time the assumption was that she would focus on her other skills (inter alia she is sporty) and she herself decided she did not want to work in an office. The assumption was that she would be looking at something sports related and practiical, perhaps physio, perhaps PE teaching with maybe some younger years maths on the side, nursing etc.
I think it is worth starting with your DDs strengths and what careers might fit. Not everyone is academic, not everyone is good at exams, not everyone enjoys studying, but also many high performing kids will not have skills your DD has.
Its the fit that matters. Then making sure you have the right training for that fit. If this means University and working very hard to get there, choosing the course carefully, and then continuing to work hard to thrive, then do it. But in plenty of careers practical experience, and training via an apprenticeship can be as valuable.
My own view is that 'a degree' is such a common currency that it has little value in itself. Employers will be interested in the knowledge skills and experience gained during those three years. And that these come from picking a relevent course and doing well, but also from experience gained from being involved in University societies, on the sports field and in term time or vacation jobs.
DD had some good if expensive careers testing organised by her (private) school. The eventual report was quite insightful, both in areas they thought she was suited to and areas which she was not. Plus suggestions on how to get there. I will dig it out and post the name but premably several people offer similar. Might something like this be an idea?