Aglaecwif implies that she does all the work there but on the other hand, she never had a child with a 1st Generation spawn. This will be her most powerful child ever, according to her, so there's a chance that it goes completely different this time around. Especially since the child will likely be as strong as her from birth, if not more powerful. Her power may even get countered from the womb.
Hell, she might not even survive the birthing. There's too many variables here. She said she wanted a child powerful enough to challenge(or kill?) God's. If she gets her wish then how the hell is she going to survive it? I didn't think about this during the Minyaks stuff but looking at it now, the Minyaks would've probably died from just trying to carry a child of the MC. Even if it was lower than S-Class because of them, it would still be around the B-Class ball park, which is Evolution Level 3 while Minyaks are D-Class or High Level 1 to Low Level 2 monsters. Monster baby would've ripped them to shreds from the inside.
We'll just have to see what kind of magic our MC seed will do for her. We're built different from those other partners of hers.