The answer is: She will read the editorials that she agrees with, but not the ones that she disagrees with.
According to confirmation bias, most people who have a strong set of view or principles tend to avoid hearing the opinion from the other sides that contradict their pre-existing principles/belief.
In modern day political culture, this will make people tend to only get their news from the news sources that are aligned with their political belief. This is exactly what Maria did.