It was alleged the foster mother lied during the Crime Commission hearing, when she denied ever hitting a child – who was not William Tyrrell – with a wooden spoon.
She pleaded not guilty to a charge of knowingly giving false or misleading evidence before ultimately being acquitted on Friday.
Last year, police planted listening devices in her home and car, as well as setting up phone taps, the court heard.
The court was played audio from one of the bugs, in which a child could be heard sobbing and saying “no” and “please”.
It was alleged by police that the audio picked up an incident in which the child was struck with a wooden spoon.
Phone taps played to the court also heard her telling her husband that she had hit the child “really hard with that wooden spoon” and “she’s going to have a massive welt on her leg, she didn’t even cry”.
During her evidence before the Crime Commission, t
he foster mother said she “never” hit the child with a wooden spoon.