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Time rewinds itself a bit, as the System Gods work relentlessly to assure that Kireina can rise into godhood.
It was not as if it was easy, even though it seemed very simple for her, every single process of her rise was mostly made by the System itself, helping her in every bit.
This, usually, would not be the case, as rising to godhood would not be as complicated for other mortals, and the power and technicality that the System needed to do for the user was never as complicated as with Kireina.
The System Gods had several problems, some of them were because Kireina was already way stronger than a Living Deity, so it would not really make sense for her to become one, and instead, she should at least become a Great Goddess based on all the power she held and after being enhanced by the Divine Energy from the environment.
Check "The Protagonist's Sister Is Actually the Strongest"!