Languages graduate here (back when dinosaurs still walked the Earth) - languages on their own won't get you much work in the UK, I'm afraid, she's going to need another qualification, vocational or Master's, in something like business admin, secretarial work, teaching, librarianship (there are still jobs in healthcare and academic settings though they're not always called librarian), translation...I would also say don't discount computer coding or cybersecurity work, if she's good at languages she'll have an eye for patterns and be pretty methodical.
She'll get a good idea of professions and career options people might not think of if she has a look on sites like NHS jobs, the civil service site, and jobs.ac.uk (as well as the usual suspects like the Guardian, indeed.com etc).
I was the first person on my side of the family to go to uni, my parents didn't discourage me and were proud I managed it, but once at university, when I met people from very academic families, I realised how much support many of those kids had had, and took utterly for granted, so I really sympathise with your position. Although the careers advice I had at school was laughably bad (we had one session once a week by someone who was not a trained careers officer, it was mainly all about university prospectuses and whether there was a sports team/officers training corps). If I could go back I'd choose a different subject and different university, frankly. I've had to acquire various bits of academic and vocational wallpaper since, on a regular basis.
In 30 years I've been offered 2 jobs that had anything at all to do with my languages (and then not as the main area of work); I now do tiny amounts of translation along with various other things but the two most useful skills I acquired were typing (okay, plus computer package knowledge) and driving. Plus getting work experience as I could in the holidays and evenings (mainly customer service).
As others have said, many employers don't care that much what your degree is in for a lot of the "graduate" type roles (though they're harder to get than they once were). If she feels like seeing a bit of the world and she's okay with the idea of teaching she could also consider something like the JET programme (Japan) or the EPIK programme (Korea) for a couple of years once she's graduated.
And also, if she's not on there already, the Student Room website is packed with masses of useful information. Good luck!