For a supposed expert on Egyptian gods and Sarah Page doesn't know anything about Egyptian gods.
She keeps insisting that she saw the demon Ammut. Aside from the fact that Ammut is a Demon Goddess, which isn't the same thing, Ammut has the head of a crocodile (either with long human hair, or a kind of ornate headdress), the torso of a lion, and the hindquarters of a hippopotamus. Over two thirds of this form are conspicuously missing from the prehistoric crocodile Sarah saw.
Sobek is the God depicted as either a crocodile, or as a man with the head of a crocodile. As a fertility God, and, in some beliefs, the creator of the Nile, Sobek was an important God and Sarah should have known about him.
Sarah Page got almost everything backwards when she talked about Egyptian beliefs about death. Getting to the "underworld" was the goal, a reward at the end of a arduous trial. If a person's heart weighed more than the feather and was fed to Ammut, their punishment was that they would not live forever in the underworld.
When the maid is trying to open the doors she's says they're locked, however the lock on those types of doors is on the inside and clearly visible in the scene.