Suphia/Chronology

Human-Monster Interaction Arc
She was sent as an emissary with Albis and Grucius to Tempest to see if they can start diplomatic relationships between the two nations. After Rimuru introduced himself she commented that it was an embarrassment that a slime was the leader of Tempest and started demeaning him. This enraged Shion so much that she decided to deal with her personally. After passing the initial test she and Albis had a conference with Rimuru in which Albis suggested that they could provide Tempest with fruit in exchange of alcohol. Then Rimuru called Kobi to arrange the negotiations. A couple of days later she returned to Eurazania.

Demon Lord Awakening Arc
Some time later she was seen back at Tempest after the people of Eurazania searched refuge from the war between Milim Nava and her Lord Carrion. She was quite surprised that Rimuru had ascended to Demon Lord and she put herself under her orders until her Lord was rescued.