The fire "quickly began to rage out of control" and the group fled the scene. They were caught by police, and the fire had to be put out by the local fire service. Albert told police she knew it was wrong to light the fires, but she was "bored" and it was "exciting" lighting them, Ms Willemsen said.
Albert pleaded guilty to arson, but defence lawyer Stephanie Burlace said her client disputed several details.
She said Albert lit the first two fires, but not the third.
She also said Albert did not make any comments about being bored and finding it exciting to light the fires.
"That was made up by the police, was it?" Judge David Cameron asked.
He remanded Albert to August 1 for sentencing and ordered a pre-sentence report.