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Uh, no. The author never tried to redeem her actions as a mother, just tried to explain her side of the story too. Simply put, she abandoned him to prostitution as a child. What you get in the main story is some kind of closure between Momo and his mom.
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His mom was a rape victim, got the blame in return and when she basically got "back stabbed" by Momo, she was furious.
Blinded by her hate and rage for Momo she left him to suffer for his actions of seducing her men and that happened.
Either way both of them have to shoulder some of the blame.
This is why you must protect yourself. With today's rape allegations against people and many using that to frame other people, it's either going to be taken very lightly or be brushed off.
Momota's mother needs to die painfully and horrifically slow and suda needs to be stab profusely.