Judo IMO you held your ground. Keep her mother out of the sitch this is between you and your W besides blood is thicker than water and eventually her mother will turn on you.
You know that you will have to follow through with the L or risk losing the value of your word with your W. Time told me once that just because you file does not mean that the D will happen. Coach stated the following to me once and I added the definitions and additional words for clarifications it help guide me through my sitch:
Lead - Know your path Confidence - Act with self-assurance...Boldness Poise - Self-possessed calmness...Balance Strength - The ability to do or endure...Toughness Honor - Conduct your actions with outward respect...Integrity