Here's a sampling:
Jan. 2, 2016: "Whoever deleted Teresa Halbach cellphone calls is either the murderer or part of cover up. Either way the killer is free."
May 9, 2016: Zellner posted a photo of exonerated former inmates hugging their mothers on Mother's Day. "Steven Avery needs to be in next year's photo - plan to make that happen."
July 5, 2016: "If you think we are just tweeting ... think again. A tsunami of new evidence is on the way."
Jan. 17, 2017: "Not 1 but 8 plants: bullets, bones, blood, camera, cellphone, PDA, key, car + false confession. World's best experts on it."
But the court of public opinion and a court of law are two different universes.
Zellner has yet to file a post-conviction petition on behalf of Avery, who turns 55 in July. He remains in prison, insisting he is innocent.
"The prediction that he'd be out by Mother's Day is slim to none," said Rob Bellin, a Neenah attorney who has closely followed the Halbach murder case over the years.
USA TODAY NETWORK-Wisconsin reached out to Zellner late last week for comment regarding her predictions about the case and the criticism she has received from Avery supporters for not filing her long-awaited post-conviction motion in Manitowoc County court.
"Next time you hear from me will be when I file Steven Avery's motion," Zellner wrote in her email response. "I could care less what Steven Avery's supporters think. They have absolutely no comprehension of the procedural and forensic complexity of this case."
Zellner did not specify when she plans to file the motion.
The last significant legal filing on Avery's case was last Nov. 23. That's when she and the Wisconsin Attorney General's Office reached an agreement for independent scientific testing on nine items of evidence from the Halbach murder investigation.
"Mr. Avery will present his third party theory in his post-conviction petition that he will file once he obtains the new test results," Zellner wrote in her legal briefs last August.
Johnny Koremenos, director of communications for the state justice department, said "we have been informed that testing on the agreed upon evidentiary items is nearly complete."
Koremenos added that the state has "reason to believe that the defense will file a new motion within the next 45 to 60 days."
Zellner previously told USA TODAY NETWORK that the independent scientific testing should be finished in March.
On March 18, she tweeted, "To all the skeptics, doubters & haters just be patient because we are really going to make you mad." Zellner did not again tweet about Avery's case until last Friday, when she posted this: "Would not still be rep. SA if the test results proved his guilt. Winning takes a little longer than losing."
In her email last week to USA TODAY NETWORK-Wisconsin, Zellner said "this is not a simple DNA case where I submit samples and await the results."
"My only obligation is to Mr. Avery," Zellner wrote. "My predecessors all failed because they did not do a thorough and comprehensive job. I will not be making the same mistake."