SPRINGFIELD, Mass. (WGGB/Gray News) – A Massachusetts mom who lost her 6-year-old daughter to an E. Coli infection said she believes her child got sick from a McDonald’s cheeseburger.

Samantha Ocasio is still in shock that her 6-year-old daughter Angelica is gone.

“She was always happy. She lit up everything,” Ocasio said.

Angelica died a few weeks ago at Baystate Medical Center in Massachusetts after complaining about her stomach and bouts of throwing up.

Angelica’s death was linked to a strain of E. Coli bacteria found in her system.

“Yeah, I’ve heard of E. coli before. But did I ever think it was going to be us? No. Never in a million years did I think I would be sitting here right now talking about any of this,” Ocasio said.

Ocasio said she believes the bacteria came from a McDonald’s cheeseburger that Angelica ate on Halloween night. She died just days later.

Ocasio said before she took her kids trick-or-treating, they stopped at a local McDonald’s.

“She had a cheeseburger, and her brothers like nuggets,” Ocasio said.

Ocasio claimed it’s the only thing Angelica ate differently than her six siblings.

“All she wanted was her cheeseburger, not knowing that cheeseburger was going to cost her her life at 6 years old,” Ocasio said.

The mom’s allegation comes after McDonald’s said the slivered onions used on Quarter Pounders caused an E. coli outbreak. The CDC said the outbreak left more than 100 people sick, dozens hospitalized and at least one dead.

However, the slivered onions used on Quarter Pounders are different from the diced onions used on the cheeseburger that Angelica ate.

McDonald’s also said Angelica’s death happened nine days after they had removed contaminated onions from their impacted restaurants.

The CDC said the McDonald’s E. coli outbreak has not been linked to any restaurants in Massachusetts, where Angelica ate her cheeseburger.

In a statement, McDonald’s said:

“We are absolutely heartbroken for this family’s loss, and we extend our deepest sympathies. We take any and every report of a potential food safety issue seriously. Upon being made aware of this devastating report, we immediately reached out to the Massachusetts Dept. of Public Health, our own third-party experts and our supply chain team. What’s important to know is that the public health officials have not connected any reports of E. Coli to McDonald’s in Massachusetts or the broader northeast region.”

McDonald’s added that they will continue to assist local health officials as they investigate Angelica’s death.

Through all the unanswered questions, Ocasio now must deal with the loss of her young daughter and all the future opportunities that could’ve come.

“I’m going to miss a lot of firsts with her, and it’s just a lot,” Ocasio said through tears. “I’m going to miss a lot.”