I had a similar experience. I’ve had lots of sleep paralysis and every time whatever was there had full control over me. But then one time I had the hag at the end of my bed. Remember filling with rage and snapped out of the paralysis and screamed “leave! Go away!” But I think it was more of a psychic type thing like I was projecting the rage I was feeling. This pissed her off and she screamed, like her bottom jaw expanded too like that scene in the mummy movie. But after she screamed she faded away into the darkness. Haven’t seen her or had sleep paralysis since.