engineering education at ABET-acredited schools is pretty similar. I don’t see any benefit to paying an extra $85K for substantially the same thing.
As for coop, I haven’t heard of Case having a strong coop program the way schools like Georgia Tech or Northeastern do. In a strong program the coop is integrated into undergrad for those that participate, with scheduling of when to do it part of the 5-year plan and participation is the norm. Briefly perusing the Case webpages it sounds like coop is up to the student, and they don’t mention how many take part (at Northeastern, for example, over 90% take part). Furthermore eligibility is for juniors and seniors (although you can ask special permission as a sophomore) according to Frequently Asked Questions | Engineering Co-Op Program By contrast at Northeastern “Students start their first co-op the second semester of their sophomore year or during the summer after their sophomore year.” So you might want to do some further investigating regarding Case past what you have perhaps casually heard because it doesn’t sound much different than what any student at any college taking the initiative to find a coop can do.
If the finances work out and your daughter has other reasons than education for going OOS (college fit, living in a different part of the country, meeting people from different backgrounds, etc. are all perfectly valid reasons) then she should look OOS. But since engineering education is so similar no matter where, there are plenty of affordable CSU/UC options that produce engineers that do well in the workplace.