Well if you cannot give us any more info than this we will just have to file this under shit you made up.
She didn't make it up. It's a slightly garbled account of the discovery of Pi-Ramesses. The city was first discovered at what is now Tanis. It was gradually realised, however, that the monuments at the site had all been transported from somewhere else. Analysis revealed that the easternmost branch of the Nile, where Pi-Ramesses was situated according to contemporary documents, would have been elsewhere in the 13th century BC.
This led to the discovery of the original site at Qantir, 30 km to the south. Much excavation work has been done there, revealing the extensive evidence left behind after the city's monumental architecture was moved to follow the changing course of the Nile.