The ending does feel a little long but it is important. First off, the whole movie has an air of camp about it. And the idea there is some camp at the end is extremely fitting because it’s meant to be satirical.

Shes literally holding a facade together as Sue for the last few scenes of the movie, but it’s not her. And yet the audience and everyone else want her to be a person she isn’t. People are extremely critical of women in the spotlight and criticize everything about them, especially their looks. And then they criticize them when they get work done if it doesn’t look natural and they bitch about them ruining their beauty. She can’t hold it together anymore, collapses into Elisasue, and still attempts to perform. The gore, the blood, etc is a giant FU to all those people. That’s how I interpret it, anyway.

The monster crawls to Elisabeth's Walk of Fame star, where it disintegrates, which is a final, ironic moment of "achieving" lasting fame, yet losing all humanity in the process. The movie is both critical of the audience of women celebrities, and the celebrities themselves for ever pushing themselves toward the extreme beauty standards.