Disgraceful stunt by the opposing captain.
But what is way, way more disgraceful is that the league coordinator agreed with her. What kind of a message does that send? In my section, the captain's guidelines actively encourage captains to give opposing captains prior warning of default in order to avoid wasting people's time showing up and not playing.
EDIT: Mike Y posted right before I did with the same observation - common courtesy must be a NorCal thing