Is she screaming or is she crying? If she is crying and you think she is in pain, sick, hurt, etc… then take her to the doctor ASAP. If she is screaming, you react, she gets what she wants and then the pattern starts all over again, then she is a normal healthy child. She is loving the sound of her voice and learning how to manipulate you. Kids are BRILLIANT and master manipulators. I wouldn’t ignore the screams, just in case she is experiencing some kind of distress, but once you assess that she is not in any distress, minimize your reaction, don’t give her what she wants and walk away. Trust me; she will realize that it stopped working and move on to something else. Good Luck!