Luchadora translates to "fighter" or "struggler". It's an empowering and evocative word that describes someone who is strong and resilient.
In the song, it's used to characterize a woman who "no sigue modas" (doesn't follow trends) and "se prende como fuego" (lights up like fire), highlighting her independent and fierce spirit. This word captures the essence of a strong, modern woman who stands out from the crowd.
The title line is the whole character sketch: Ya todo le da igual no sigue modas (she doesn't care about anything anymore, she doesn't follow trends). She still gets dressed up, she still goes out, and then she spends the night dancing by herself. Magán never explains why. Exhausta de evasivas, cansada de mentiras (worn out by excuses, tired of lies) is as close as the song gets to a reason, and it turns up as a passing aside rather than a big reveal.
What the singer wants back is oddly modest for a club record: Ven a bailar conmigo, tú no bailes sola (come dance with me, don't dance alone). He asks Dime quien te hizo daño para que estes tan sola (tell me who hurt you, for you to be this alone) and never gets an answer, which is probably the point. The track announces its own genre partway through, Electro latino, and that tension is what makes it work: the words are about a woman who has stopped caring, and the beat under them will not let you stand still. The wordless hook ends up carrying the feeling that the verses keep declining to name.