Neurological experts in Edinburgh conducted an MRI scan on the battling four-year-old on Friday. It showed her brain is not dead.
But doctors have warned that if Cally is to regain consciousness, she will do so with significant injury to her brain.
Cally, from Arbroath, was resuscitated by hotel staff and holidaymakers after being found in an adult pool twice her height in depth at the Hotel Villamarina in Salou on June 23.
She is at the Royal Hospital for Sick Children in Edinburgh after spending three weeks in a medically induced coma in Barcelona.
Dad Steve said: “There has been no real change in Cally’s condition since Barcelona.
“But the doctors here told us the MRI scan found brain waves, which is good news.”
Cally fell in to the adult pool while playing but there was no lifeguard watching. Dad Steve, who had taken Cally on her first holiday abroad with family members, was in the toilet when she was pulled from the water.
He and mum Kate Miller have been told it is “improbable” their daughter will ever wake up. However, the pair cling to hope the tot will pull through.
Steven, 26, said: “The fire alarm went off the other day and she got a fright and jumped, so we know she can hear us.
“The nurses said that the rest of her body is in great condition considering the trauma she’s suffered, with both her lungs and her heart completely fine.
“Hearing that the MRI scan found brain waves is good news, but we know she won’t just wake-up out of the blue.
“We’ve been told it’s almost impossible now to predict how Cally will be in, for example, six months, but they do know she does have a serious brain injury as a result of hypoxia.”
Friends and family will host a fundraising day for the family in Arbroath’s Seaton Estate today.
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