Man, I wish I had had some of those suggestions for situations I have been in before. There were lots of good ones.
The only thing I would add is to make sure you and your husband are on the same 'team' on how to deal with this woman. It sounds like you are very involved with the league and it's probably well known you are the wife of the president. It could be very easy for a parent in the league to take something you say as the official stance of your husband and, consequently, the league. (For big things. Hopefully not on things like preferred hot dog concession toppings. Although if mustard vs. relish becomes a hot topic, I want to know
Sounds like you got a good start on this season! Hope everyone can have fun and enjoy it.