I'm currently going through UCAS and have received 3 of 5 of my decisions (3 offers)
The option of taking a gap year is a good one- she then knows what grade she holds in the subject she's studying and can make her choices accordingly for 2025 entry. She needs to find out what is pulling her grade down and how to make up the gap from where she is and where she wants to be. There is time. Is she able to resit any modules of her current course? Or alternatively if she doesn't achieve a high enough grade for the degree she'd like to do she can look at alternative options.
For example I have 'good' grades at A-level but not high enough or in the right subjects for the degree I want to do so I am currently studying an access course that's equal to 3 a levels and is a year long course. You do have to be 19 on the start date of the course but I believe there is a work around (as some of my class mates are 18!). I can ask around if you like to see how they got the course funded as mine is being funded through student finance.
Foundation years and foundation degrees are both viable options but not ones I know enough about to give you good advice.
The support from her college regarding applications sounds extremely poor but it seems like she may have been very close to their internal deadline and so her application was rushed through and not checked properly. But there realistically would have been enough time and wiggle room for this to be checked properly by the college as the UCAS deadline isn't till the end of the month. They should have given her a clear indication of her predicted grades though, as this is what unis base there offers on along side personal statements. I'm assuming there may be some portfolio based expectations for her course choice as well.
The advice I have always regarding picking courses is to make sure there is a good spread of entry requirements. For example my 5 choices ranged from A*AA thought to BBC. This covers you in terms of grades. The top grades being achievable but aspirational and the lowest being what you would get even if you got the lowest expected grades.
If she does go through UCAS again many unis offer workshops on writing personal statements. There are many exemplar personal statements to be found online if she struggles with formatting or simply the style Unis are looking for. To get into particularly competitive courses you have to show why you're a good candidate, what your experiences have taught you and to stroke the ego of academia somewhat. Going to and speaking to tutors at universities on open days is always a good idea as they may give her solutions to bridge the gap from where she is now to where she wants to be.
This isn't the end of the road for her passions though, she has plenty of options that she can succeed with.