Is she tugging her ears? Besides the screaming and calling your name, does she communicate any pain anywhere? If she's not in pain or sick, then it might be that she's experienced a nightmare and might need some reassuring that she's safe. Tots can go through sleep regressions at 2.5yo too which can last a couple of weeks. I do controlled crying with my son, if he cries for 15mins straight then I will enter his room and try to help him calm down by patting his back but not pick him up. I stay for a short period based on how worked up he is and how long it takes me to calm him down then quickly leave and restart the timer. If he stops crying within his 15 mins by himself then I restart the timer from when he started crying for 15mins. Good luck!
Does she have all of her teeth? My daughter started doing this and she’s just getting her molars