Does she have executive functioning issues or ADHD? If she suffers from anxiety she could have other disorders too. It sounds like you’re frustrated that she’s taken longer than 4 years to graduate, but you acknowledge that she’s not being purposely wasteful. It’s not uncommon for students with those types of issues to need a reduced course load and additional time to graduate. Have you tried talking to her? Maybe if you tell her you appreciate her efforts and are excited to attend her graduation and want to make a celebration of it with the whole family – dinner out with all your children, for instance – she’ll be happy to share the details with you.