You can do sweet fuck all about the results now, the exams and course work were ages ago. Your panic and stress will not change the results she gets next week.
Doing A Levels and going to Uni isn't the only route to success and it isn't the best route for every individual and for every career path.
Her best bet in life is to study, train and work in something she's passionate about, interested in, and has the natural aptitude for or the resilience to improve through practice and learning and development.
Has she been previously a strong acadmeic student and something's gone badly wrong with her GCSE mocks? Is this a set one girl who's had a health set back or several unfortunate events (e.g. revising hard in one area of a subject only to turn up and the questions are all on a topic she's not revised) or has she always been in lower sets with lower grades and you're only just twigging that it might make things tricky for the vision and ambitions that you have for her life?
I've seen you poo poo apprenticeships but I know young people who are doing or are awaiting A level results before pursuing really good degree apprenticeships which are an incredible way to engage with higher education while still earning. The teens I know doing this are doing accountancy or engineering so they're going to come out with a degree and professional exams in those areas AND they'll have a good few years of work experience through their industry placements AND they're paid during the course AND their industry placement PAYS for their degree.
I also have a child in their late teens who left sixth form college before completing the course but went straight into a job which has hands on learning and they're on a really decent wage, with responsibilities for others, and with an ambition for using her skills and experience in this sector to travel the world as it's a job that can give that opportunity.
I've also seen you poo poo hairdressing as a career. If that's what your daughter LOVES and has an interest in, it's a great career to get started in and she doesn't have to do it forever and ever. I have friends who work in hair and beauty who have their own businesses, work flexibly, employ other people, have used the skill to travel abroad (e.g. working ski seasons, on yachts, for abroad weddings, for celebs etc). I know some who work in TV and film. It's not a one size fits all.
I've also got mates who did a more hands on and creative career but have retrained in their 30s or 40s with a degree to enter work in healthcare or teaching. Not everyone is in the best place for that level of learning at 18 but it doesn't mean that's their only chance to ever get a degree.
Not all children and young people are academic and that's fine. That doesn't mean that they don't have ambition and skills and potential.
Which GCSEs did she do? Were some stronger than others? What's her plan for next year? 6th form at school or at college or something else? AS / A Levels or BTEC or International Bacc or something else? I know at school 6th form (and at our local 6th form college), students are supported with resits for especially English and Maths.
What does your daughter want?