@LaLaFlottes
The UCAT is a weird test. As I have said previously, it is an aptitude test, so not like GCSEs or A levels where, for a smart child, working a bit more or in a different way can lead to excellent results. There does seem to be a natural level, as a range, that applicants can achieve, dependent on their intrinsic aptitude.
However, there is no doubt that scores can be improved considerably by good preparation as speed is one of the main things tested (so quick assimilation of info, ruling out irrelevant options and knowing when to cut your losses and move on). This is where many people get stuck. With enough time, most people sitting the exam could answer most questions and some DCs get stuck with "just a few more seconds and I'm there" on the early questions and have no time for the later ones. Yet they are all worth the same marks.
So your daughter's approach of familiarising herself with the format and how to answer the questions and then working on speed is a good one for many people. It is like all tests - the amount of work needed and the preparation style is individual to all sitting it. My eldest did about 2-3 weeks of prep at a couple of hours a night, has dyslexia and ADHD, which showed as he came out with 890, 900, low 700s, high 600s! We did not apply for more time, which may have been a mistake, but luckily his score was high enough for the med schools he wanted. #2 watched a few youtube vidoes and fiddled around with a few questions, but did not worry in the slightest about it (or any area of the admissions process) throughout - he is the unusual one, in my experience. And DCs who allocate some time to work at it on a regular basis, forget, have more "important" things to do and then cram for the last few days - which is sadly a pattern for my offspring!
So my advice for your DD is to prepare how she knows works for her, but not to expect to score in the way she has in more traditional exams (at almost full marks, by the look of her results), where people are encouraged to methodically work through and answer all questions. Some questions on UCAT are definitely harder than other (or more accurately, more time-consuming) so should be intelligent-guessed, flagged and move on and actually will take less time than some of the middling ones! So not answering some questions with a worked through solution is not a bad thing - it just leaves more time for those where marks are easier to come by