It will be another 2 years until the manga reaches the moment you are referring to.this makes me try searching when was "the moment" for Mahiru..... maybe at this point she already "lost"? mmm....
Don't worry, this chapter takes us to the end of LN Volume 1, and that ended with the exact same line xDThis felt like a "we're getting axed and have to wrap things up right here and now with one of those 'and the adventure continues' non-conclusion endings" scenario.
It will be another 2 years until the manga reaches the moment you are referring to.
I would advise to avoid explicit spoilers like that, even if the anime has far eclipsed that point in the story. Saeki-san, the author, had confirmed in one of her QnA's that the moment you described was the moment.I dont think it was the moment related to her mother. On the Novel kinda implied it was earlier than that.... thats why Im trying to see when it was mmmm