Opinions welcome on A level options

My immediate thoughts were that maths would be required. Why not get her to email the admissions department of a university that offers the course she's interested in and see what they say.
I am boring myself now with offering this suggestion on these sorts of threads

Many universities will take geography for science courses, so that is certainly a possible.

She needs to google courses that interest her.

DD is hoping to do three sciences and art. She wants to do marine biol (so needs biol/chem).

Had long debates with DH about maths, he finds maths really easy, DD1 and I don't. I have and she's capable of scraping an A, but we both find it hard work.

I got a grotty A level (D) DD1 is dyslexic and has put her foot down. She says art keeps her sane, 4x hard subjects is too much.

I'm going to be a bit harsh here, but if she's only on course for a C at maths GCSE, how will she cope with Chemistry A level? Biology, yes, but Chemistry? There is a lot of maths in it.

If she really wants to be a researcher in chemistry or neuroscience, she'll need a degree which most probably requires a Maths A level ( or at least a maths AS as theas suggests). But if she gets less than an A at Maths GCSE, she will probably find that too tough.

So maybe she should be looking at a different longer term path - perhaps in the technician or lab assistant type of career?

Geography is a possibility - as this would open up the Earth sciences e.g Geology and Environmental Science. However this may not be possible without Geography at GCSE.
An essay subject such History would demonstrate breath. However English Lit would also show similar skills.
Students who are good at Science also seem to do well on subjects such as Economics, Pyschology and Philosophy.
HTH

I didn't say maths because you said she'd decided against it. Is this an informed decision? Or does she just not like maths? It is very, very useful for a kind if science degree, even the biosciences which are less numerate at school level than Physics. Even if she got on a degree course without Maths, she may well struggle without it.

My DS did biolong chemistry music and maths at AS and dropped the maths for A2.

I'll be the lone dissenting voice here. Choose a subject you love, preferably a "rigorous academic one" eg music, english, history even RE (if it's the ethics based course). Not psychology- it's really not rated at most unis even for psychology courses, but a narrative arts course is fine.

On the basis of biol/chem/music DS is holding an offer for neuroscience at Nottingham which looks a very good course indeed.

Definitely don't do maths or physics just " because" if it's going to make her miserable- there is a heck of a lot to " put up with" in A levels you don't like. Maybe do AS maths, get and A and then can it!

IT?
German - a lot of scientific research is published inGerman.
Business - if she considers the commercial pharmaceuticals side of things?

Maths is so so important in a science future. It will be a big part of any science based degree program.

I would opt for Maths or Physics definitely.

If she wants a future in science she really really really should do maths. Really.

psychology, english ?