[quote=@Holy Soldier]
[@Emma]There's already a queen. She's still a princess. Her mother isn't dead lol.

If Madeline had been a boy, then the boy would be King, but she isn't so her mother rules.
[/quote]
Her mother was only queen consort. So by marriage margaret was queen. But Madeline is the Kings heir. When he died she became ruler of the kingdom. Since she is young her mother or the hand of the King, or even her fathers brother can rule as proxy till she comes of age, but she is the queen.