I'm trying to remember which quest Royal Trouble is. Given your response, I'm thinking about the part where you already saved the princess.
If this is where you're at, let me tell ya what I know works.
1) Inflate the princess via seeds in her chambers (bottom left of the third floor with the King and Queen)
2) Go belly goblin mode by getting 50 seeds for the underground peeps. If you need the code, talk to the clown for a bit or buy your way to it.
3) Talk to the queen after the fact. That should allow you to deal with "Like Daughter Like Mother" quest. I am calling it this 'cause names are hard.
4) Get the goddess to help out.
5) Expand the Queen by giving her what she wants.
This should complete all of the Royal Troubles. I hope this helps a bit.