Actually, this is a plot-related change. If Peorth communicates with the gods about her inability to summon and gives proper offerings, her ability to summon will return. This isn't on the website but it was stated on several different development posts.

We will need to amend the website to add this in; it seems that the development team left out this clause.

Given this fact, are you still intending on dropping Peorth, or would you feel comfortable playing it out ICly and having her regain her summoning powers through actual play?