Assuming she didn't just throw up the cake - it literally jumped out of the stripper - I'd probably take out a shotgun and blast the possessed pastry to Hell and back. The dead stripper too, just for good measure. You can never be too careful; wouldn't want her coming back as a zombie.
Then I'd eat the cake.
Evil cake always tastes better with a good peppering of blood and lead. XD
...
I know, I'm twisted... >_<