It's very clear that the author wrote this for the reader to sympathize with the father; the author's purpose is clearly to relate that she's made major mistakes in her life, misplacing her relationship with her father. She even mentions that her 'supposedly perfect marriage' [to a rich Princeton Ivy Leaguer like her] ended up in divorce.
It's very clear the tone, and it is in no way subtle; this is a piece meant for compassion for the father, and I assume is a cathartic release for the author. By writing it up and admitting her faults openly, she's giving herself the chance to forgive herself.