Old School RuneScape uses the British convention for floor numbering: Ground floor, first floor, etc.
Queen Sigrid is the queen of the island of Etceteria. She can be found on the 1st floor[UK]2nd floor[US] of the Castle of Etceteria.
While players are doing the Throne of Miscellania, she will tell the players how she came to be the queen: she was not from a royal family, rather married into one. During the conversation she will often complain about how boring being a queen is.
Sigrid is the solution to the hard anagram clue: SEQUIN DIRGE. She will then give you a puzzle box to solve.
During Royal Trouble, her goods are stolen by some teenagers pretending to be Miscellanian soldiers. When the goods are returned, she will ask you to give a letter to King Vargas. When read by the player, it becomes known that she harbours a love-hate relationship with Vargas, and that should he be freed from his curse and become human again, she would like to 'get to know him better'. This marks the end of the long-lasting feud between the two nations of Miscellania and Etceteria.