{Spoiler for those who haven't read the Spin Off series of Mushoku Tensei Old Dragon's Tale}
I don't know if this is correct or not but i think Elinalise may have a more important role in the near future. In the Old Dragon's Tale Rostelina a long eared race individual who was chosen by Laplace was put to a long sleep only to wake up in the near future to help Orsted defeat Hitogami with her large mana pool. It was said by Laplace that Rostelina will lose her memory due to the changes in her body, When i put the pieces together I started to realise that the Elinalise who was found with no memory in the dungeon may be Rostelina the girl who was put to sleep by Laplace. If this is the case than maybe our lustful Elinalise-san can be an important role in defeating Hitogami.