One of my favorite theories, by no means provable, is that since the left side of the brain controls the right side of the body and also language (both of those are true actually), it’s literally disparaging the side of the body it doesn’t control and praising the side it does, which is why so often “left” develops negative connotations and “right” positive ones.
Since handedness is genetic, there is a chance that that’s what she was told when she learned to use the right hand (pun intended)
https://english.stackexchange.com/questions/39092/how-did-sinister-the-latin-word-for-left-handed-get-its-current-meaning yea, stupid ideas are contagious and latch onto language and culture, apparently. In Italian, left is still “sinistra”, so that creates other fun puns like learning to use the sinister hand.
One of my favorite theories, by no means provable, is that since the left side of the brain controls the right side of the body and also language (both of those are true actually), it’s literally disparaging the side of the body it doesn’t control and praising the side it does, which is why so often “left” develops negative connotations and “right” positive ones.