Leaving aside all the subjective opinions on the thread, some data might be useful.
As someone who has regularly recruited from a pool of high achieving graduates, Kate’s CV on leaving university would definitely put her in the talent pool that such employers will assess for employment. Obviously, that’s not the route she chose to go down, but she could have.
To put that in context, the main graduate employers (e.g. accounting, armed forces, financial services, technology , public sector, law etc) recruit around 20,000 graduates a year. So she’s comfortably within that 20,000. So, that’s a lot.
To put that in context though, there are 800,000 students leaving higher education each year. So she’s in the top 2.5% of university graduates in the UK.
And to put that in context, in 2012 (closer to Kate’s era than more recent stats) 14.1% of 18 year olds in the UK went to university. So she was in the top 1% when compared to her age group.
It’s up to you whether you think that makes her mediocre, outstanding, or somewhere in the middle!