IB through train school students don't have any public exam before IB diploma exam. But a lot of IB schools in HK use IGCSE then IB diploma. For those students they have IGCSE results for reference.
In your case, the universities applied should fully understand the academic path of your kid: DSE syllabus then A level. No public exam taken yet. In my view the transcript from the HK school for Form 4 may be needed. Pls check with your kid's UK school now.
I mean she was studying DSE syllabus in HK Form 4-5. Right? Not sure if you need to provide Form 4-5 internal academic results given by the school, as the results provide a track record of her academic performance. Better check with the Counsellors of her UK school.