Not yelling but constantly telling her no, stop doing this or that, leave your sister alone, don't take that from your sister, stop running on the couch, etc.

it's exhausting and I hate it. But I swear she doesn't listen or hear me! When she gets in trouble (or thinks she is) she gets upset so I know she isn't deliberately trying to misbehave.

I need to work on reframing more with her but man. Any good books or anything with tips for dealing with this?