You can add 'at all' to a negative statement in order to make it more emphatic. You use 'at all' with any negative word, with 'without', or with a broad negative.
She hadnowriting abilityat all.
'There's no need' said Jimmie. --- 'None at all'.
They run educationwithoutany controlat allfrom central government.
Hehardlyread anythingat all.
Broad negatives are explained in paragraphs 4.83 to 4.90.