That's the plan. I don't mean to sound like I'm trying to be mean or a jerk but I really think she needs to feel some of the pain from her decision to leave starting with sleeping somewhere else.
That needs to be her choice though. Don't kick her out of the bedroom, but don't leave it yourself either. Your attitude should be "I am sleeping in the bed, you can sleep here or you can sleep somewhere else, that's your choice." Same thing with separation, your attitude should be that you are staying and you hope she does too, but if she wants to leave you won't stop her. We call it "opening the cage door". A lot of WAS's feel like they are stuck in a cage, so the idea is to let them know you are not trapping them, they have the free will to stay or go.
When you get back in the bed expect one of two things. She will either go sleep somewhere else or she will sleep so far over on her side of the bed that you will swear she's developed some kind of hovering skill where she is defying gravity and sleeping on 2" of bed. Don't expect her to throw her arms around you and welcome you back to bed though, LOL!
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I am beginning to think the only reason I got the "I really want to remain good friends" speech was because she wants to keep all the comforts I provide in her life and keep me around to make her life easier all while not having anything to do with a real relationship with me.