What are you paying for? If I understand things correctly, her housing and tuition/fees are covered. She’s 26 so she’s not on your insurance. She’s old enough to be independent for the FAFSA, so if she hasn’t already maxed out the student loans, she has access to money to cover costs of food, insurance, etc.
Why is it so hard for you to just walk away? She is not going to do things the way you think she should. You need to find a way to accept that, and just let her be.