Bru this story end is bad.. maybe its the machine type of translation was part of the problem, n not to forget how the mangaka likes to keep things “mysterious” way too much that its confusing
Tbf, the last chapter implies the raws Dayment got were from a Korean release, and this is not the first time Dayment has recurred to this (I remember reading their TLs for Shima Shima, and I vaguely remember a similar incident, years ago). Which, you know, is not exactly the best way to translate stuff (JP -> KR -> ENG), because it was already translated a way into another language, and there might be stuff that got lost between the cracks as it gets translated again from there w/o the obvious source. In a professional way, this is not the best way to translate stuff. But, if this was the only way Dayment could complete the series, well, that's better than nothing.
That being said, this kind of ending I kinda expected it, given the nature of the slice of life formula, not a fan of timeskips that leave everything else in the open, lol. I suppose as someone else pointed out in the other comments, there are "seeds" that imply that, even after a longer time, our protagonist seemed to have cut off her contact from her ex and child's life, so she could get a fresher start (although she basically woke from the wrong side of her futon for that, lmao). Maybe it's because shame, maybe it's because it was better to start of fresh (I dunno, I'm not a fan of "cutting yourself from your child's life" when divorced, even if an attempt to get better was there, and our unemployed protagonist really tried it out, so I am inclining into a mix of both: not being able to provide and give her "more", so start a new was the only option left). But once the kid gets older, I suppose the baton was passed to her if she wants to keep in contact with her mother. Which is valid, tbh.
I want to think that, once the kid is a teenager, the mother simply didn't tell her that she finally moved out. She is very clumsy, so, there's a chance smth like that happened. We don't know which grandma she calls, as well, so...