It might be worth emailing some university departments, but I applied for medicine and you need high grades (A - A*) in all four subjects, more than one science topic to have a good chance. There's so much competition.
A postgrad course would be an option but I'd look into costing - I believe some people get NHS funding but this is a lot less than a student loan, and you'd need to support her financially almost completely unless she took a year out to save. Working alongside a medical degree is almost impossible, especially the amount of hours she would need.
American or European universities are an option, but she'd need to make sure they were transferable to the UK if she wants to work here, and again look at the funding situation.
Nursing, mental health, nutrition etc are all less competitive, or a French degree could put her in good standing for a career in business or translation. It probably wouldn't get her onto a post grad med course though - they tend to need a first/very high 2:1 in a science, and if she struggled at GCSE that might simply not be possible.
I was really shocked at how much chemistry was in my first year - I did much more chemistry and physics than biology, and it was really hard. I got As across the board for the sciences, but it was still so difficult.
I hope your daughter doesn't feel too down. I share her dream, and it's tough when obstacles come in the way, but being realistic could help her save a lot of wasted years and heartache.
What do the school think she should do? They'll know her strengths, and may suggest things she hasn't considered yet.
I hope this helps.