Monroeville police said Lynaa Eva Dobbins, 20, went ballistic when she discovered that her ex, Garrett Lee Cogdell, 21, invited his new girlfriend to his child's birthday party on Saturday night.
Partygoers knew Dobbins was "coming to cause problems" and told manager Randi Kania to call the cops sometime around 7:30 p.m., police said. But before they arrived, Dobbins and two other women stormed the kid-friendly pizza joint and started a brawl with several women there, police said in a complaint.
Cops said Dobbins stabbed Brea Carter in the ear with a pair of scissors and hit Karen Wynnbush in the head with a brick during the rampage. No children were hurt.
Police arrived and found several women arguing outside the restaurant.
lynaa dobbins/via Facebook
Cops said Dobbins, 20, was jealous that her ex-boyfriend's new girlfriend was at a birthday party for the man's child.
Dobbins was arrested and charged with multiple counts of assault, reckless endangerment and stalking. She was being held at Allegheny County Jail on a $100,000 cash bail.
Two women with her were questioned by police but not arrested.