No guarantee that this is a female because it's still young and smaller.  But appears to be a female.

The Mayan swordtail (Xiphophorus mayae) is a striking and active livebearer native to the freshwater streams of Guatemala and Honduras, prized in the aquarium hobby for its vivid coloration and elegant sword-like tail extension in males. Males can grow up to about 2.8 inches (7.2 cm), while females are typically a bit larger and more robust in body shape. These fish display iridescent green or bronze bodies often accented by horizontal red or orange stripes and a sharp, black-edged sword on the males' tails. In the aquarium, X. mayae thrives in well-filtered tanks with moderate flow, and ideal water parameters include a temperature range of 72–79°F (22–26°C), a pH between 7.0 and 8.0, and moderately hard water. They are peaceful and social fish, making them well-suited for community aquariums with similarly sized, non-aggressive tankmates. Like other livebearers, they breed readily in captivity, with females giving birth to free-swimming fry after a gestation period of about 28 days. Providing plenty of cover, such as plants and rocks, helps protect fry and enhances the comfort of the adults. Their colorful presence, hardy nature, and dynamic swimming behavior make the Mayan swordtail a lively and attractive choice for freshwater enthusiasts.