No charges have been filed against the young woman so far, as the Hillsborough County State Attorney's Office continues their portion of the inquiry.
The boy had been left in the vehicle since Tuesday morning.
Meteorologists with ABC's local affiliate WFTS said the temperature pushed 90 degrees Fahrenheit in Brandon on Tuesday.
Investigators say a child has died after being left in a hot vehicle all day outside a Brandon shopping center on Tuesday. She took him to a nearby dialysis center, in hopes they could give medical aide. Hillsborough County Fire Rescue arrived and took Jacob to the hospital where he later died. He died later at Brandon Regional Hospital.
Best Friends for Kidz released a statement on Facebook on Tuesday, confirming Jacob's death. The grief was palpable as this family is now without one of their own, 2-year-old Jacob Manchego.
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From what we know, the cause was heat exhaustion. Silva-Tello, 21, arrived around 9:30 a.m. and went inside, leaving Jacob in the vehicle, an email from the agency said. "We remind ourselves, we remind our family, we remind our people that pick up our kids - look back there and check". For reasons unknown at this time his sister made a tragic mistake. "We feel confident in this statement as an intentional act of cruelty would not be within her means", the statement said. "Trying to find the parents".
Parents picking up their children from the day care rushed them past reporters and crime scene tape.
Sheriff's Office spokesman Larry McKinnon declined to provide information about what detectives have learned about Silva-Tello's daily routine, how often she brought the boy to her workplace or whether he was enrolled there.
The investigation into Jacob's death is ongoing, the sheriff's office said. The sheriff's office said investigators will be reviewing prior history related to the child and any previous calls for service at the family's home.