Hmmmmm....I am trying to put myself in her shoes assuming she is sitting on the fence trying to make a decision. Maybe do one or two romantic gestures (not over the top ones) and see what the reaction is. Watch her face. If she seems sincere then maybe do a few more. If she looks uncomfortable, but is trying to be nice then I wouldn't do that anymore.
Now, if there is any doubt in your mind that she is done and just trying to play nice for the kids or her own guilt then I wouldn't do anything. I would go with the complete 180. Let her think she has lost you and you don't need her anymore. Right now she knows you are right there. If she had some thoughts of you moving on then maybe she would change her tune.
You know more than anyone what she may be feeling.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!