Mom worked for the CIA, but was actually a double agent for Russia. She speaks Russian.
Despite this, she could get another job working for the CIA later in the series.
She and her husband originally appeared in the Oh Yeah! Cartoons shorts as recurring characters, but they had a significantly different character design and their faces were never revealed (similar to Cartoon Network's animated series Cow and Chicken); the top of their heads were sometimes visible, however. In one of the Oh Yeah! Cartoons shorts where they were seen from the back (the episode is titled Party of Three), she had red hair as well.
Mrs. Turner was a real estate agent in earlier seasons, but since Season 6 onward she is mostly portrayed as a housewife. In "The Old Man and the C-", she made it clear she'd rather make Timmy get a job than have one herself.
It has been revealed that she used to be called Barnaby.