I absolutely did and I stand by it. She's an adult. She can take care of herself. Or so she herself has said.

"Somewhat depressed" does not equal "totally okay to throw your rotting trash on the floor for someone else to deal with, say you'll clean up after yourself and then just not do that at all, and claim to be "too busy" to clean and then take off for a week vacation with your friends and not say anything and just expect your roommate to take care of your cat in your absence, conveniently forget to pay your rent every month until you're reminded to do so." 

Who has not been somewhat (read: mildly, minorly) depressed at some point? Who has not been a little blue and spent a little too much time watching Netflix in bed?  Doss that allow you to literally throw your garbage on the floor and neglect the wellbeing of a creature that is totally dependent on you? No. It does not.  And I've given her loads (LOADS) of time to amend her bad behavior, and multiple chances. I've tried fourteen different ways to help her improve, including offering to help her clean things up, buying cleaning supplies for her. And she has not improved, and given no good reason for not doing so. At all. 

This is a last resort for dealing with a shitty (though "nice") person who apparently will not respond to anything other than last resorts.