One possible theme could be that of secrecy and privacy. In a world where she feels dejected, the secret bedroom serves as a place where she can keep her thoughts, feelings, and perhaps secrets away from others. It might also deal with themes of mental health, as her dejected state could be a sign of depression or anxiety, and the bedroom is a place where she either hides from or tries to confront these issues.
Perhaps it could be about a royal daughter who is dejected and uses her secret bedroom as a place of solace. Maybe she hides away from the pressures of royal life there, and the story could revolve around her self - discovery within those four walls.
There could be a hidden passageway. Maybe it leads to a secret chamber where the royal keeps valuable items or information that could change the fate of the kingdom. It could also be a place where the royal stores memories of happier times, like mementos from family members or friends, which now only add to their dejected state.
The secret bedroom might be a sanctuary for the princess. It's a place where she can be herself away from the pressures of her royal duties and the judgment of others.
Perhaps there is a best friend who tries to reach out to the dejected daughter but is constantly shut out. This friend could play an important role in trying to understand what's going on with the daughter and why she is so withdrawn in her secret bedroom. Another character could be a sibling who either teases the daughter, adding to her dejection, or is sympathetic and tries to help.
Obviously, the dejected royal daughter would be one of the main characters. She is the center of the story as it's her secret bedroom. There could also be her maidservant who might be the only one aware of her true feelings and the things she does in her secret bedroom.
Maybe only the royal's most trusted servant. This servant has been with the royal for a long time and is sworn to secrecy.
There might be heirlooms that hold great significance but are too painful for the royal to display publicly. Maybe these heirlooms are related to a lost family member or a bygone era of the royal family that the character is sad about.
Well, from the title 'the secret bedroom of dejected princess novel', it could imply that the story centers around this princess's private space. It might be a place that holds secrets, like hidden letters or a diary. The fact that she's dejected might suggest that there are some unhappy things going on in her life that are somehow related to this bedroom.
I'm sorry, I haven't actually read this novel specifically. But generally, a 'secret bedroom' in a novel about a dejected princess could be a place where she retreats to, perhaps a space that holds her innermost thoughts, secrets, and a sense of privacy away from the prying eyes of the court or those who have caused her to be dejected. It might be filled with mementos that are important to her, like old letters or gifts from a happier time in her life.
Possibly the royal's personal guard, if they are extremely loyal. They might be the ones to protect the entrance to this secret bedroom. Another option could be a wise advisor who is allowed in to offer counsel during the royal's moments of despair. However, if there are any secret societies or factions in the story, they might also be trying to gain access to this bedroom for their own motives, whether it's to find secrets to use against the royal or to help them regain their former glory.