It is a queen acromermex sp (formiga cortadeira) try and keep her in a small tub with moist paper on the bottom and see if she lays eggs in a few weeks if not let her go but try and find one with out wings as this one might not be fertile because she still has wings Best time to look is at early morning or late afternoon after it rains.
Place her in a small container with a layer of plaster of Paris or organic soil, keep humidity at 90%+ and temperature 23-25C in an incubator to avoid adjustments. Very hard species to care for for beginners. I'd reccomend giving her to someone advanced unless you want a challenge ;) Very fun once colonies are big. She doesn't have any fungus - without it she will die. I have some fungus, PM me.