It could be a fluke, 1/2 cup is pretty little so I would go ahead and feed lunch at the regular time and keep an eye on her. If she throws up again today I would fast her tonight and then put her on a bland diet of overcooked rice and either chicken or ground beef for a day or two to reset the gut.
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 5 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010