Marissa is using rationalization as a defense mechanism when she says, “So what if I broke her stupid toy? She’s always bothering me when I want to play video games and no one should have to put up with that all the time.” This is not listed among your options, but it involves justifying her actions by blaming the other person for her behavior.
From the options you provided, none accurately capture the essence of what Marissa is doing. However, if we had to choose one, projection might seem the closest, as she is projecting her feelings of annoyance onto the other person by implying that their behavior justifies her actions. Still, it's important to note that rationalization is the most precise description of her defense mechanism in this context.