What happened to Rainbow Dash's mother?

The Mane Six get married and have kids! The only problem is that their kids are enemies. So when Queen Chrysalis' daughter kidnaps their parents, the children must work together to save their family.

Diamond Tiara is mad at Silver Spoon for ditching her, so she plots her revenge.

Silver Spoon wants a new attitude. The only way that'll happen is if she isn't under Diamond Tiara's influence.