Hi kaykay, your daughter has done amazing overcoming her illness and seems to be doing incredible.
Firstly, her GCSEs are absolutely fine. Yes, it means that strategically, she'll have to forget about some schools, but she will still be a very good candidate for many of them.
At this stage my advice would be research research research, here, on tsr, on each individual school website, and all the medical schools advisory sites. There is so much information and to start with, it feels overwhelming, but gradually, you'll know exactly what school offers what.
It is good that your DD knows what she wants, but what I've learned, and I think a number of mums this year, is that unless you are an exceptional all rounder candidate, both in terms of looking good on paper and at interview, you have to consider not so much where you want to go most importantly where you are likely to be accepted.
I've learned a lot through before starting the process but also afterwards. DD GCSEs were not great (3A*, 6As, 2Bs) and she also got a Band 4 in her UKCAT SJT, which limited her choices to those schools that didn't consider it. At the time, it seemed the end of her chance to get in, as it is, it turned out to almost be a blessing because by limiting her choices, it made it much easier.
What I learned during the process is that picking St George Uni was the best choice because they offer places as they go and she got an interview mid Dececmber and an offer before Xmas. It took all the stress away and that made a huge difference. Also a lot of learning in terms of course. DD opted for Manchester as a 4th choice, last minute, traded it with Exeter, but she wasn't keen on the course, never been to Manchester, and it was very much a case of applying by default and only a choice if all others failed. As it turned out, she had three offers (still waiting on Bristol) and Manchester has now made it top of the league after she went there for her interview. She loved everything about it. The course is not as PBL as candidates think it is, and even though she would indeed prefer to have immediate contact with patients, which she would do at St George, everything taking into account, Manchester is winning at the moment.
Your daughter seems to be doing everything to give her the best chance at the moment. Over the summer, she will need to give a 100% preparing for the UKCAT as this really is the most important part to up the chance of interview, but not being in the top 25% doesn't mean her hope is over either. It's great that she seems to have set her heart of Cambridge, but she'll need to consider it along her chances next October.
What I have found with DD is that her experience, work, volunteering, babysitting for kids and parents she never knew before, taking her driving test and starting to drive, all those things have really helped her with her confidence and maturity and this is what has helped her with the interviews more than being able to talk about it. None of the schools she had offers to read her personal statement and it has hardly come up during the interviews.
Good luck for next year and hope you get the same support from other mums here we've had had this year.