Hi there Gabriela - first of all, congrats on the achievement! That is no small task and certainly deserves a HUGE round of kudos for the hard work that must have went into improving your grades. I absolutely would address the upward curve, candidly, in your admissions essay. You can also speak with a college admissions representative about your experience and progress to augment your application. Celebrate the achievement as a learning opportunity and one that your are both humbled by, for the lessons it caught you, as well a pride for making the uphill battle.
You got this!