A Texas preschooler has died of COVID-19, just hours after the first symptoms appeared, her mother said.

Kali Cook,4, died in her sleep at home, her mother Karra Harwood said.

“We are still investigating it. The child was in school, in a Pre-K in Galveston County, but we have investigated that, and we do not believe this is related to her being in school,” the Galveston County Health Authority said in a statement, local media reported.

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The official cause of death is yet to be determined though the officials of the Galveston County are terming the death as COVID related. The autopsy report is still awaited.

Kali had tested positive of COVID-19 at the time of her death. Her mother said that she was a healthy kid and did not have any underlying comorbidities.

“If your child is under the age they can be vaccinated, and they get COVID, or they have symptoms which might be COVID, you should take them to seek care right away. Most kids do absolutely fine. In fact, many kids are asymptomatic, but if your child is having some sort of symptoms, it’s a good idea to take them to be seen,” ABC News quoted Dr Philip Keiser of the Galveston County Health Authority as saying.

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More than 300 children in the state of Texas are hospitalised due to the virus.

Kali was studying in the preschool at KE Little Elementary School in Dickinson ISD. The school clarified in a letter sent to parents that she had last attended school on September 1 and the school was never notified of any COVID exposure or positivity.

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Meanwhile, remember her daughter, Karra Harwood told the Daily News, “She was so funny and sassy. She wasn’t your average little girl. She’d rather play with worms and frogs than wear bows. She was just so pretty and full of life.”