Less than a week to go, thank God. She’s ran out of space to expand downwards, and is now just getting wider. Not evenly, though – one side is decidedly wider than the other.
A dog’s uterus is “U” shaped, with two horns, so chances are that Delilah is carrying more puppies in one horn than she is in the other. This would explain why she’s lopsided. Poor girl. It can’t be comfortable.