OIN, my H is sleeping on the couch also. I feel like he's trying to punish me, so I make sure that I don't respond, lots of happy doggy noises coming from the bedroom (my three dogs sleep with me) and first thing in the a.m. when he's outside the door in the bathroom, I am talking happy talk to the puppies... I never know if acting happy is keeping him on the couch longer, but it's making me happier when I have to wake up alone.
It's so frustrating, when you focus on something like this. One of my goals is to get H back into bed with me, and I don't see it happening. I think he is afraid b/c when he's there we have ML a few times (there's a PA with OW in the pic right now)
Try looking at it from her point of view. Why is she doing this? Is it a punishment like my H is doing coupled with fear of being close to you? Maybe understanding her motivation doesn't change things, but it makes it easier to keep up your PMA.