My son also had night terrors. They started when he was about 2 also. He used to shout, "mum, mum, mum, (never Dad)! He be sitting up in bed, but not aware of his surroundings. I used to go in and calm him and stay with him, sometimes lying beside him until he was calm and sleeping again. They stopped at about age eight, just after we'd moved to a new house. In the morning he could remember nothing about any of it. I know how exhausting it can be, but they do grow out of it. I think that giving up her dummy at the time the night terrors started is coincidental.