Queen's Queer Quest

The river-bank had a visitor- a royal guest.
The Queen was working & looked busy.
The onlookers had no clue about her quest.
They felt a Queen's life is fun & easy.

Everyone had a quizzical expression on their face.
What's the Queen searching like one possessed?
Picking pebbles seemed like some queer chase...
Collecting pebbles made the Queen feel blessed?