The main goal of the game is for Celica to become a powerful mage who can use her magic on monsters of varying strength. This requires alchemy, skill development, increasing mastery level, and using artifacts. If you maintain this balance, then there are usually no problems.
In your case, it seems that you forgot to help Celica learn skills. As soon as she learns a few, the tailor will come to the square (plaza).
The Agranor library contains books with tips for beginners and how to gain skills.