Marigold Girl idolizes Queen Tara and asked her mom if she can be queen when she grows up. She does become the new queen. She's not given a name, but let's look closer: MARIgold Girl or Mary. Remember that in the Bible, Mary was chosen by God to help the world. Queen Tara chose Marigold Girl to continue helping their world.
Boggans and their forces expressly represent rot and decay, but mushroom characters are heavily implied to be allied with the forest proper. Mushrooms being fungi that feed on decayed matter, they'd logically be boggan-servants instead.