Her dialogue in Elpis expressed that she would avoid bringing the subject with Convocation members so it felt like she avoided them at first and did things on her own. At a later point, around the time of Zodiark's summoning she made contact with the Convocation to stop them from sacrificing half of the replenished life to bring back the first batch of sacrificed.
Also, the ancients were masters of creation magic, pretty much anything could be created from it so it's not so unreasonable especially if someone such as the revered Venat was to say it.