Hand over Herbal Liqueur to Panicked Woman. She gives you Silver Coin x50 as reward. Herbal Liqueur can be obtained from Innkeep at Novis Port or Cheese-Loving Noble at Zofia Castle.
Mila's Chamber
Once you visit the Chamber, Celica promotes to Princess, her exclusive class. If her level is not 20, head to B2F and use Sacred well on her. After that, go to B1F control room and open a floodgate. Then, Chapter 3 Celica part ends.