I don't know if the "god" who created Ariadne put her in the labyrinth of the 8th district as the "first hidden god", the raw web novel and the english light novel don't clarify it, but it is true that he considered her a "failed product".
Whether or not she can become the strongest hidden god is debatable, but what she does have is a tremendous affinity with the MC's "Rearguard" ability, the hand seen behind her at the end of this chapter is something that she calls "Guard Arm of the Mechanical God", and in the novel says:
“If you intend to protect your companions from behind… then I will protect you from here.” The space around Ariadne warped to reveal a gigantic mechanical arm. She would use her remaining strength to protect Arihito and his party. She decided she wouldn’t sleep until she heard his voice. After all, a god did not need to sleep.
And that Guard Arm has already protected them against nameds that they have faced. Currently they have awakened/recovered/acquired two items compatible with Ariadne, an intelligent sword (with a personality of its own) called Murakumo and Alfecca a kind of vehicle that fits the image of "Iron wheel".