It's changed.
The sands have shifted from what she was used to, overnight what had once been a familiar backdrop changed, the sands retreating to form other things she couldn't see. So she had decided to get a better look.
And then she had the dream.
It felt wrong, the man that was not a man, familiar and yet not, telling her to seek out the pyramid.
The boring, unworthwhile pyramid.
And it brought her to hell.
Scorching her back, toasting her fur in unpleasant ways, burning her pawpads in the sun OH how she longed for shoes. Pollux was now heading towards the pyramid for it's welcoming shade, to hide out until the sun went down and it cooled down for her to explore further...but when she saw others enter through a hole...well.
May as well go see who else had been called to this hellscape.
The beast of a yearling made her move, slipping in after the others.