That's not crazy, Raul Rosas Junior had a debut at the age of 18. As the MMA is becoming popular every day and UFC is gaining more fans, as well as the quality of life improves, medicine level and talent pool increases, we should expect more and more young fighters to make a debut in UFC.
By the way, this girl has such a legendary surname. Alex Pereira is one of the greatest UFC athlete. Alex Pereira's sister, Aline Pereira is also a fighter too, so this is probably in their blood.
Thought I heard she already fought before her debut at UFC Noche for Karate Combat 52 in Miami at the beginning of the year.
so yes that is different from the men who have already younger fighters.