Not really. She had been taught that the water receding like that is the FIRST STAGE of a tsunami, not a separate event which could only be connected with a tsunami by some wild stroke of intuition.
This is like saying that when you see someone reach for a doorknob, you're "predicting" that they're going to open the door and go through it. Technically true I suppose, but this is not "special knowledge" - it's knowledge commonly taught in school. I heard it in school several times, as have most other people I have talked to about it (at least, people who were actually paying attention in school).
The surprising thing here is that the girl was able to convince so many people. I suspect this is because she's a damn smart and serious kid and her mom knows it and gives credence to what she says. Good job too, but as has been mentioned, many thousands of people actually did the same "prediction". I heard at least one story of a man who had seen the water receding, started shouting at everyone to get the hell off the beach, a tsunami was coming; everyone ignored him, he made it to the hills but a lot of folks didn't.
My favorite story was about the stone-age tribes in the area who still pass learning down generations verbally. They live on low islands. They saw the water receding and immediately either went into the hills or if in their boats, went as far away from land as they could get as quickly as they could. The only reported injury to anyone in their tribes is that one woman hurt her ankle when she fell out of a tree she was climbing. When the coast guard sent a helicopter to check up on them soon after the event, they shot arrows at it.