I agree with what was said earlier...the vet is in order, it does not look good. It could be that something ruptured. And if she's acting lethargic I think that's even more of a reason to get her some help ASAP.
0.0.1 Pastel Ball Python "Mocha"
0.0.1 Colombian Rainbow Boa Het. Leucistic "Aurora"
0.1 Vietnamese Blue Beauty "Jelly"