OP- HS kids don’t realize how many different career paths are possible within the overall field of psychology. So I wouldn’t get hung up on that- kids will change paths, find something else more interesting, etc. The path to becoming a social worker who works in a counseling capacity is very different from a PhD in Clinical Psych. For the former, having volunteer experience with vulnerable populations (homeless shelter, working with kids in foster care, prison visitation program, hospice) is much more important than actual research under the supervision of a lab, other researchers, professors, etc. So in my mind, since you are comparing undergrad at credible universities with lots of resources-- I wouldn’t focus too much on the outcomes right now. She doesn’t know what she doesn’t know.
I’d help her figure out how important the urban/not urban piece is. And for you guys to figure out whether living with a sibling is actually a practical solution. I had a sibling at my college- we overlapped for two years- and it would not have worked for us, even though we were very, very close (and actually had shared friends, shared activities, etc.)