Mortal provides his mother with food. When he accidentally drops something in the kitchen she jumps and runs towards a corner and starts crying, which causes him to stop what he's doing to hug her and cry with her. She calms down, they eat in silence, and she doesn't ask him how he did it or how he met Promise or who the boring fairy with highlighter yellow hair is. They don't talk much, and after they're done eating she says she wants to sleep, so Mortal finds her a place to and stays with her until she falls asleep. Which takes quite a while, and even after she does she tosses and turnes and murmurs, which she never did before Thorn.
And she wakes up screaming a few minutes later.
So Mortal only returns to the main computer room to check on the last stages of Thorn-wrangling a couple of hours after that, once he's managed to get his mother to relax enough to get some rest. She'll probably be there a while.