this story has two things i love

1- It is not limited to interacting only with humans but includes the millions of extraterrestrial life forms that would exist in a microbial universe like this one: hell with so many galaxies there are infinite combinations for each species, even Ava could meet "cosmic entities "that consume planets haha

2- Ava is really a goddess and takes advantage of all her power,  is incredible as she can destroy galaxies or put a black hole in her nipple and in a few seconds appear in a "normal" size on a random planet. I especially loved her obsession with the stars!

There is a lot of potential here

Another nice tale you have spun. The concept is quite fun, a humble housewife who midnights as a nigh-invincible destroyer of galactic civilizations. As always, your detailed, explicit descriptions pace the story quite nicely, you really get a sense of scale and power at Ava's disposal.
One thing I would be interested in this story, if you plan on augmenting it, is what exactly is the nature of Ava's relationship with her husband? It appears to be stated in this story that he's rather ignorant of his wife's activities. Does she genuinely love him, and goes out of her way to hide this side of her for fear of what he would think? Does she barely tolerate him, since all he offers her is the visage of a normal life? Is she resentful, since she feels he's holding her back, and wishes to dispose of him? There's a lot of interesting avenues in having a relationship with such a powerful being.