"I felt my chest getting tight, it was hard to breathe," recalled Booth.
She didn't know but she was going into shock.
"I thought, oh my God, what is happening to me? I felt like I was going to die."
In the emergency room in nearby Oakland the diagnosis was severe allergic reaction and from here Grace Booth's story reached officials in Washington.
At that moment, Booth says, she had no idea that the corn tortillas in her lunch were about to be recalled. She wasn't thinking about Starlink corn until afterwards.
In the wake of the recalls more than 50 Americans, including Booth, claimed they had reactions to Starlink corn. That forced the government to launch the first full-scale allergy investigation in the history of biotech food.
It has taken months, but the Centers for Disease Control and the Food and Drug Administration have collected food samples and blood from two dozen people whose cases were believed most serious.
"Varied from just abdominal pain and diarrhea, skin rashes to some patients, a very small group having very severe life-threatening reactions," said Dr. Marc Rothenberg, the allergy chief at Cincinnati Children's Hospital. He is an adviser to the government in the Starlink investigation. Its slow going he says because investigators first had to find the Starlink protein and then invent a blood test.
Even if the test shows allergic reactions, Rothenberg believes it's unlikely there's enough Starlink in the food chain to threaten the general public's health.
"My gut feeling was that this wasn't a significant concern, this was not going to be a major problem, like a peanut problem," said Rothengerg.
Right now the length of the investigation is what's eating at Grace Booth. She's waited seven months for some answers.
"If I want a bowl of cornflakes, I want to know that it's safe to eat a bowl of cornflakes," said Booth. When asked if she felt level of safety now, she said, "Absolutely not."
She still has half of a suspect enchilada. The government is testing the other half, and says it will have results next month. Every corn farmer in America, every miller, every food maker and the entire biotech industry now awaits the verdict on what it was that made her sick.
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