Kids or Teens fantasy book

Young female protagonist finds out her missing father is part of a shadow organization that had been banished from their village/kingdom. She feeds a random man porridge who then turns out to be her father. Her best friend lives above a bar and makes “potions”. It has a blue cover. Female protagonist lives with her mom and a cat and I think a little brother or sister. One night the cat gets out and stuff happens, I can’t exactly remember. They have a troll of goblin like creature that’s name is similar like the word goblin