Court proceedings end for the day
Justice Yip has brought court proceedings to a close for the day.
The trial will resume at 10am on Tuesday.
The defence opened their case last week and today co-defendant girl X faced cross examination.
The 16-year-old told the jury she heard a scream and turned round to see her co-accused - boy Y - knifing Brianna.
The court has seen an alleged handwritten 'murder plan' found in girl X's bedroom and been shown text messages between her and boy Y, allegedly showing the plan to lure Brianna to the park and kill her.
Girl X, sitting in the witness box beside an intermediary to look after her welfare, wiped away a tear as she denied murder and said any talk of harming Brianna was just "a fantasy".