Is Maci getting some form of revenge against Mack?

We’re all wondering why Maci is going so hard for Amanda…is this some sort of revenge for Mack blaming Ryan’s substance abuse or lack of intervention on her?

Mack clearly knew Ryan’s issues and read that letter to Maci putting the blame on her. Is Maci holding this grudge years later and still has no empathy for Mack at the end?