McCurdy is currently marketing her novel "I'm Glad My Mom Died," recently was in " Red Table Talk" along with Jada Pinkett Smith Willow Smith, and Adrienne Norris.
In a video shared by People magazine, McCurdy can be heard reading an extract from her novel that includes an email from her absent maternal grandmother, Debra.
Her mother was said to have seen photos online of the teen Nickelodeon star and an unidentified man.
She wrote "I have been so dissatisfied with yours. You were once my dreamy little angel but now you're just a tiny flabby, a SLUT all used up ..."
McCurdy said "What happened to my good little girl? Where did she go, and who is this monster who replaced her? You're an ugly monster now."
McCurdy says, "I told your brothers about you, and they all said they disown you, just like I do. We want nothing to do with you.
Love, mom. Or should I say Deb, since I'm no longer your mother. P.S. Send money for a new fridge, ours broke."