If Hatshepsut Was Erased From History, How Do They Know She Existed?

If the pharaoh Hatshepsut was removed from history, then how do they know she ever existed. They say that her half-son ordered her to be erased, but if he did then all official records would have been erased. Her monuments and her tomb were hidden and all mention of her was carved out. So how do they know that she was a good ruler or that she ever ruled at all?