Hallie, from Coventry, needs treatment which her family say cannot be provided by the NHS.
CAR-T works by removing a type of immune system cell, called a T cell,Those cells are then genetically modified in the lab to make them more effective at targeting cancer cells, multiplied, and infused back into the patient drop by drop.
A trial is due to start at Great Ormond Street Hospital in the coming months but Hallie's aunt said they would prefer not to wait that long and were hoping to take her to America instead.Ms Dugdale said she and her sister had talked about having children for a long time and said Hallie is "the sweetest little girl, she's is so gentle and kind-natured".
Ms Dugdale said she hoped they would be able to start the treatment before they raised the full amount.Follow BBC West Midlands on
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