Happy Birthday to your youngest daughter! I'm sure she enjoyed her special day w/her friends and her father. I'm also glad to read that your xw did send her flowers and I do hope she decides to put them in a vase and enjoy them...after all...it's not the flowers fault that her mother hasn't grown up.
The memories that you and your daughter shared on her special day are priceless and she'll always remember them.
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.