Look up intrinsic motivation and extrinsic motivation.
Most children can't see beyond the end of today, let alone in 5 years time. What many don't realise is that a failure to work now affects their chances further down the line. That is why you are worried.
Biology GCSE seems pointless at times. And so does Physics etc. Why bother with a language?
Maths, who needs that, I've got a calculator in my phone? English, waste of time, I can already read.
Your DD needs to feel inspired about what her life could look like in the future and see beyond these petty statements above. Have you taken her to places where she could imagine herself doing a certain kind of job?
School is not really tied to reality, yes there's a disconnect between school and work and it's your job as a parent to bridge that gap.
Had she ever had a job? Does she know the realities of hard work. What it's like to work in a charity shop or in a supermarket for days at a time.
Ask her how much she wants to earn when she's older. Then work back from there. You need this degree for that, you need that set of A levels for that degree, you need these results at GCSE to do those A Levels. etc.
You can use fear or you can use inspiration to motivate her. Maybe buy some books off Amazon to understand more about motivation yourself and bringing up teen girls so you can help coach her towards her best self. There's lots of good advice out there.