watch the body language the more I think about this she is giving off lots of clues I hope the next night you tried the couch again or at least until you could jump back in bed and say why one earth you sleep on that uncomfortable thing I don't know -
imagine you are her you know her well what is it you would be trying to say without saying
do you think she is waiting for you to make the first move do you think she thinks YOU don't want her heck you have been sleeping in the big lonely bed for a long time now and what does that look like from her position does she think you are happy not sleeping WITH her does she think you like sleeping in the bed alone
did she huff and puff and move around waiting for you to get closer to her waiting for the next move
what do you think your behaviours are saying to her