Expect to be told no. Be happily surprised if they say yes.
Taking a student into their practice to observe is a BIG ask. Many large or multi-specialties practices have specific policies that prohibit this, particularly for under 18 students.
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It is quite possible to matriculate into med school directly from undergrad, but not easy. It takes very careful planning and excellent time management on the part of the student.
Since the med school application process takes a full year plus, the student must have everything (GPA, MCAT, LORs, ECs, personal statement, etc) they need to apply completed by March/April of their junior year of college. (Usual deadline for requesting a committee LOR).
This means front loading science classes so they can take the MCAT during spring of junior year and starting regular community service with disadvantaged communities/groups soon after arriving on campus. If they are considering research-intensive med schools or a MD/PhD, they’ll also need to find a research lab to work in during their freshman year.