"Long live the King," she added in her Facebook post.
The latest order follows a rare criticism of royal motorcades and other inconveniences that Thais have expressed massively in recent months.
Last year, the #royalmotorcade hashtag became one of the top-trending subjects on Thai-language Twitter.
Another recent hashtag, #islandsclosure, also rose to the top of the Twitter trending list over the New Year's holidays, as southern tourist islands were closed off for visits by the king's youngest daughter.
King Maha Vajiralongkorn inherited one of the world's richest monarchies when he ascended the throne in 2016 following the death of his father.
He was crowned officially last year in May in an elaborate three-day coronation ceremony.