You are overestimating yourself.

Beca was taken aback, for a moment, not understanding what Catrin intended to say. 

"Beca," Catrin began, her tone soft yet firm, "I chose Fosters as Arwen's second family because I believed in you. I knew you would protect her, stand by her side, and treat her like your own daughter. That's why I am ready to overlook all that Ryan did to her." 

But her words only made Beca frown. "You shouldn't, Catrin," she said continuing. "You shouldn't ignore all the things that Ryan did to Arwen. You are her mother. In this whole world, you should be the last person to ignore all that Arwen had suffered. This is cruel, how can you even say that?"