A beloved child actor has tragically passed away after suffering multiple heart attacks, her mother has confirmed.

Millena Brandão, 11, fell ill last Wednesday with severe headaches and was rushed to Granjaú General Hospital in São Paulo, Brazil, where she died Friday.

Brandão, who appeared in the Netflix series Sintonia, had 13 cardiac arrests between Wednesday and Thursday, according to her doctor.

Brandão’s official cause of death was still unknown as of Monday.

‘The doctors still haven’t said what really happened to my daughter and what killed her,’ Brandão’s mother, Thays Brandão, told Brazilian news outlet G1.

Millena Brandão experienced headaches, pain in her leg, drowsiness, loss of appetite and had fainted since April 24.

During that time she visited a city urgent care center and two São Paulo state-run hospitals.

Doctors initially believed the young model had dengue fever before additional tests revealed a brain tumor.