Although it's important to start thinking about career options, if there isn't one that stands out or that she's really passionate about then the best way forward is to choose subjects that she is good at and enjoys. As she studies these subjects at a higher level career options may become clearer. Consider, also, what her interests are outside of school, is there a hobby or interest that might lead to a career? Are there any political or charitable causes that she's passionate about that might lead to a career? Careers don't always have to come from academic study.
Stimulating, high-paying, fulfilling career is most people's goal. Sitting at a desk staring at a screen is very few people's goal. That's not much to rule anything in or out.
"She wanted to do med but current state of the profession puts her off massively"
I feel that if she was genuinely passionate about medicine then the state of the profession wouldn't put her off. If it was a vocation she'd want to pursue it anyway. But aside, she could opt to work in private healthcare, or she could work somewhere overseas with a more thriving healthcare system.
You say maths isn't her strong subject so I'd just drop it. And you say she enjoys bio, chem, psychology, and that she loves history. Could she manage four subjects at a level? That seems like a great combination of four subjects that could keep a lot of career options open later.
I studied three a level subjects, then I did a degree in a subject that wasn't available at a level, then I had a successful 20-year career in an industry unrelated to any of the subjects, then age early 40s I changed careers and I'm doing extremely well self-employed doing something else. Career paths don't need to be set.