I wish I knew a better way to handle this, in all honesty you probably took the best option in being silent and letting her run out of steam. Most people can't be spoken to properly when they're overly emotional so it'd be best just to not take what she said to heart.
In that case you shouldn't even engage her whenever she mistreats you or seems stressed/upset if she's just going to take it out on you. Ik that doesn't sound like a solution, and that's bc it isn't really. Idk your mom so it's hard to pinpoint the problem and fix it from there.
