Terri Moulton Horman had the second test scheduled for Saturday but was "not very happy about it," her longtime friend Jaymie Finster tells The Oregonian".
Finster told the newspaper that Horman is "tired and frustrated with the intensity of the questioning she's been getting." A source confirms to PEOPLE that she took that second test.
Horman, who initially told police she watched Kyron walk to his second-grade classroom at Skyline Elementary in Portland, Ore., the morning of June 4, reportedly has had inconsistencies in her account of what she was doing that day.
Multnomah County Sheriff officials released a questionnaire Friday with a picture of Horman and a truck resembling her Ford pickup in hopes that it "jogs people's memory of that day."
Reporting by ELAINE ARADILLAS