Midwest Student Exchange Program (MSEP)
https://msep.mhec.org/about
You can also look at a lot of flagship state universities which give tuition discounts for out of state students with good scores. Alabama, Iowa, Oklahoma are a few that come to mind.
What does she not like about U Missouri-columbia, U Missouri-Kansas City, or U missouri-St Louis?
Geographically, at least, the last two seem like they might be okay, and flagship state universities (columbia) attract really good students constricted by finances. So one of those three might work unless it's a missouri issue...