Police said a post mortem examination will be carried out in the coming days.
The girl's 23-year-old father, who is from west Belfast, appeared at Craigavon Magistrates' Court on Friday charged with causing grievous bodily harm to his daughter.
District Judge Mervyn Bates granted bail to the man, who can't be named for legal reasons, and said he had to live as far away as possible from the family home.
He was also ordered to surrender his passport, lodge £1,000 with the court and two sureties of £900 and also not to contact potential witnesses or other family members.
A spokesperson for the PSNI explained: "Following the court appearance of a 23-year-old man in Craigavon this morning detectives from Serious Crime Branch will be consulting with the Public Prosecution Service in relation to this case."