She "did not perform her duty in a timely manner" and "allowed the inappropriate posting to be on the website for too long", AP news agency quoted Judge Kampol Rungrat as saying.
"I expected to be acquitted, but I found the judge's verdict logical and reasonable," Ms Premchaiporn told reporters. "However, I still think the verdict will have an impact on self-censorship."
The verdict came amid ongoing discussion over Thailand's lese majeste laws, which are intended to protect the monarchy.
Critics say the laws have been increasingly politicised and used to curb free speech.
The discussion intensified after a Thai man in his 60s who was jailed for 20 years for sending text messages deemed offensive to the royal family died in prison earlier this month.
On Tuesday a petition carrying 27,000 signatures urging reform of the laws was submitted to the Thai parliament, said an AFP news report.
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