In Portuguese, could this also mean "She decided immediately" ?
Earlier, "já" was given as a possible solution for a sentence with "immediately" in English. I'm not sure but I think it was something like "Venha cá já !".
So maybe in this order : "Ela decidiu já" ? Or "já" as "at once, right now" can only be used with imperatives (kinda like in English, e.g. "Stop it already !")