Last night she tweeted: "There's such a beautiful moon smiling down on us tonight - so pretty it breaks my heart and I weep."
The Courier Mail is reporting that detectives have renewed calls for help from the public about the hours leading up to Elijah's death.
Elijah drowned after his father fell from the Logan Bridge with the baby in his arms.
Fisher emerged from the river and walked home, allegedly telling the his wife and Elijah's four older sisters, "Elijah's drowned. Elijah's gone."
He was charged with murder around midnight on Saturday and the baby's body was recovered on Sunday morning when water police found it washed up on a riverbank 1.5km downstream.
Inspector Chris Jory said police were seeking further information from people who may have witnessed the alleged murder.
"We've already had some really good feedback ... and I think there was even one caller who had some photographs of the area," he told the Courier Mail.
"There have been a lot of people who have been quite touched by what's happened.
"It's very tragic."
The Fisher family lived a nomadic lifestyle between Australia and New Zealand. Fisher's parents had ties to a former cult in New Zealand, the Worldwide Church of God.
While the church, established in 1967, now describes itself as "simply an Evangelical church with normal orthodox ideology", Pastor Dennis Richards said it used to be known as a "cult".
"We used to get the label 'cult' which was to do with issues over doctrine, things we believed that were outside core orthodox belief," he said.
