Please clarify if your daughter wants to be a military doctor, or, eventually attend medical school and go into a civilian medical path after her obligated service time or however long she stays in the Coast Guard?
People can and do, years after their undergraduate degree, get out of the military and use their post-9/11 GI Bill to attend graduate schools of various kinds, including medical. They usually take some undergraduate science courses to refresh, and prepare hard for the MCAT. Graduate schools like diversity, and that includes age and life experience too.
If the SAF Search function doesn’t work well for you, use Google, and in your search string, include “site:serviceacademyforums.com”. (Spacing intentional.) There are many discussions about medical school after the SAs.
To echo comments in other posts, the military gets the majority of its doctors from civilian undergraduate and medical schools and the military HPSP scholarships. There is very limited opportunity out of the three DOD academies and ROTC, and some limited opportunity to apply for competitive transfer once commissioned in the services that have Medical Corps. Coast Guard does not have its own Medical Corps, similar to Marine Corps. There have been recent discussions in the CG forum on this topic
Two other areas to explore:
The military medical school at USUHS at the Walter Reed National Military Medical Center in Bethesda, MD. People come out of civilian colleges to attend, plus a handful from the DOD academies, degreed prior enlisted service members, and degreed veterans who have separated from their services. Age limits apply.
www.usuhs.edu
One of the seven uniformed services (NOAA and USPHS are not armed services), the commissioned corps of the Public Health Service has excellent career paths in medicine. They also get to exercise leadership - running pop-up hospitals for COVID, etc.
(Browse all the links on the commissioned officer corps.).