He hit it right on the nose. That what she is going through is both grief and Survivor's guilt.

Leanne didn't really care anymore if he was nearby or not, nor did she feel him moving to her branch and placing her on his lap. It was odd... Just how comforting his presence was. From the way he was holding her, being careful with her wings, to the soothing hair stroking.

".... No... If you knew..." Her sins, everything she has done before they were stolen from her. "Exactly what I mean... I am the last one... The last of my kind... The last Heron."