Sunny, Let the slip up go and continue moving forward. There are going to be times when things just pop out. It wasn't nasty, just a comment to hers.
Keep moving forward and try not to worry over every thing you say and do.
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.