@LaLaFlottes sounds like your DD has a great approach to the UCAT.
For my DS the big issue on doing well in BMAT was state of mind.
He did it in October for 2019 entry with about 10 days of moderate level prep (revised the Biology content as he had dropped it after AS and did about 10 years of past papers) and got 4.8, 5.2, 3A which was good enough for top 20% at Leeds and just over average for Cambridge but significantly lower than all the practice papers he had done.
For 2020 entry he decided to do the August one, and we entered him before he got A level results as the deadline for entry was before results day. His results (before an appeal) were not good enough for Cambridge which was the only BMAT one he was applying to, so he was not sure whether he would take the exam.
He went to a festival for the bank holiday, came back exhausted and did 4 days of light prep because he had been entered and we were appealing an A level results, so he thought he might as well, but was very laid back about it. He got 7.0, 6.8, 2.5A, which was in line with the results he got in past papers at home under exam conditions.
My conclusion was that for BMAT state of mind was critical for him and I have seen a lot of people on TSR who get much lower results in the real thing than in their practice papers. I would encourage people not to burn out and get stressed over the preparation.