I’ll just echo others–so many people successfully go from such a variety of colleges to med schools, including colleges in rural locations with no affiliated hospital, that an affiliated hospital can’t possibly be a necessity. Sometimes a convenience? Sure. But not a top level factor.
I’d suggest there are three basic top level factors.
First, as relevant for your family, cost. Med school is very expensive and many students and their families would benefit by saving as much as practicable on college costs so they can use those resources for med school instead. Or something else, in fact.
Speaking of which, second, anticipating you would be happy with your college even if you ended up deciding premed is not for you. Like you might identify some other health career you prefer, you might in fact discover an aptitude and interest for something completely unrelated, so it is a good idea to choose a college where all that would still work out well.
Finally, in a related point, anticipating you will thrive overall, including academically and non-academically. For med school, and really in general, actually thriving in college is more important than exactly where you go.
As for what contributes to thriving, that is a complex and often personal subject. But I would again suggest some basics include feeling like you are very well-prepared academically, feeling comfortable with the curriculum approach, feeling comfortable with the location (including distance from home as relevant, climate, and so on), feeling like the social scene will be suitable for you, feeling like the dorms and dining will work for you, feeling confident you will find student activities to balance your academics, feeling like the campus will be an energizing and comfortable space for you, and so on.
OK, so if Santa Clara would be comfortably affordable, would be a good place even if med school does not end up the plan, and would be a place your daughter anticipates thriving overall–great! That’s the big stuff, and the lack of an associated hospital should not in my view trump that. Of course if there was another equally suitable college and you used that as a potential tiebreaker, sure. But it observably is not critical, and so in my view should not be elevated to a top level concern.