I would also agree that UW seems like the odd one out here. Either go for an in-state UC or go for the full other place experience.
It seems like Northeastern is clearly the top fit choice, and I don’t think being far away or somewhere new is a reason to not go. If anything, college is a great time to try living somewhere new. That said, the cost is nothing to sneeze at. How affordable is that?
It sounds like it’s completely up in the air if medical or law school is in the cards, but worth noting that saving money in undergrad is always the right call for those, and UCSB and UCI are both very much respectable and won’t hinder you in the pursuit of medical school.
My personal take is that Northeastern is worth it if it’s easily affordable and it doesn’t seem likely that med/law school are in the cards. It’s a good fit it sounds like, a new experience in a new place, and has a very solid undeclared program which I would actually recommend she switch to (can do so before enrolling or attending even) if she does end up picking it: https://undergraduate.northeastern.edu/explore/
I assume she is well aware of co-op and likes the program?
With all that said, if it requires even a single dollar of loans, forget about it and pick the best fitting UC. The economic choice here is absolutely a UC, but I think fit can be worth it in some cases if money is not a concern.