The wacko woman who allegedly snatched a 4-year-old boy away from his grandmother outside a Brooklyn McDonald’s on Monday has been busted for the heinous act, according to police.

Chrissy Payne, 47, of Flatlands, was handcuffed around 11:45 p.m. Friday — days after she allegedly yanked J’Marke Roberts from his 66-year-old grandma outside the fast-food joint on Eastern Parkway near Utica Avenue in Crown Heights, authorities said.

The brazen suspect tried crossing the street with the boy before his off-duty cop mom, Anyia James Roberts, grabbed him back, sources told The Post.

Payne was hit with charges of attempted kidnapping and endangering the…

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