The course at St Andrews is only half the studies needed to qualify as a Dr in the UK. Remaining studies which form the full Medicine degree are taken at another university in the UK.
https://www.st-andrews.ac.uk/subjects/medicine/medicine-bsc-a100/partner-medical-schools/
So to be a fully qualified doctor via St Andrews, she would then transfer to another uni to complete the full doctor training to be able to practice in the UK. Does she want to move during the course? All the unis listed above are very different environments to St Andrews.
Even if you have the full UK medical degree, matching into the USA residency process is very difficult I believe. @WayOutWestMom is the expert on this. However, if you complete your degree in the UK, and gain enough experience, you can then move back to the US. But you will need to be able to work in the UK first.
The other issue is that Medicine degrees are partly funded by the NHS as the students will eventually end up working there. So places for international students, who cannot work for the NHS and will leave the country, are VERY limited.
Options for study abroad for pre meds:
- Study BSc Medicine, Biological Sciences, Biochemistry, etc as an undergrad in UK, take a Post Bacc course to ensure all US Med School requirements are met. Then apply to US Med School. Whether the St Andrews BSc in Medicine is enough for Post Bacc courses in the US is something you would have to figure out.
- Study abroad for a semester or year (although highly dependent on getting all Med School classes checked off at the home institution)
If the main aim, however, is to shorten the time to MD, then an accelerated BS-MD program in the US would be ideal (although v hard to get into)