Yes, I was just about to say the same when I saw your post.
My son fell out of love with Maths after GCSEs and refused to do Further Maths in the sixth form saying A level maths was enough for his sanity! He did Maths, Physics and Economics at A level.
When we looked at Unis/Courses, he was adamant he didn't want to do a Maths degree, and went all around the houses looking at alternatives such as economics, natural science, physics, engineer, accounting, etc. But it kept coming back to Maths because he genuinely excelled at it (Grade 9 at GCSE and A* at A Level).
By really thinking about the bits of Maths he liked, and those he hated, he came down on the side of liking algebra, probability, statistics, etc and it was the scientific and engineering side of Maths that he hated.
We started looking at various "maths with physics/computing/economics" degrees, but they were still pretty heavy with the maths he didn't like, so we kept looking and eventually found some Unis that do "Financial Maths" which included economics, accounting, finance, probability, statistics, etc. , i.e. all the areas he actually liked, so that's what he ended up doing and is about to graduate with hopefully a first this Summer.
So, the OP shouldn't really discount Maths related degrees and encourage her son to look at the modules to see just what kind of Maths he'd be studying as it might be mostly the bits he likes. As for economics, accounting, etc., yes, there's obviously a lot of Maths involved, but it's at a pretty low level mostly, and the harder bits are probably nothing harder than Maths at A level/IB. To be honest, if it's the scientific/engineering side of Maths they don't like, then they're probably best avoiding science/engineering degrees!