I'll answer your PM in Spanish, but wanted to bump the thread too: If she turns black in the cage it is probably because she's trying to adsorb heat, which would be normal. Mine do that if I take them outside in the sun, they'll get dark and flat and take in more sunlight.
Unless you mean that she's fine outside but is dark in her cage inside. This also sounds more or less normal, my female used to do that sometimes.