I agree w/Andrew...low key and very neutral. Nothing over the top, a nice generic card and a gift card might do the trick. Nothing too personal or romantic for now. She hasn't done the hard, necessary work to win you back.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
