I wouldn't worry about what her family and friends think about you and whether you give her a gift or not. At this point in time, I wouldn't give her a gift. After all, you are in the process of selling your home and the divorce may be around the corner. However, if you opt to purchase something for her, the best gift is a gift card to one of the places she frequents. Keep it simple and impersonal.
Try to remember...she fired you as her husband.
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.