It has already been three days since Amy started the mission.
Her collection of artefacts was cleaned with ocean water during the time she spent searching for them, but unfortunately, she was unable to unlock them yet.
In addition, it was discovered that the items had a connection with the ocean. Thus, she used ocean water to clean them up.
When doing so, the artefacts began to glow as if they were recharging with mana. Unlocking them, however, was not possible.
How did she manage to discover all those artefacts, you ask? It's only because she learned a new skill.
Amy experimented with something new on her second day.
Although she hasn't learned much about mana control, she knew there was so much more she could do. So she didn't just rummage inside the burned hut for artefacts.
She made it a challenge for herself, walking to the beach and meditating there for an hour, overcoming her frustration.
Such patience is admirable.