I think it is 1, It is an everyday life theory because it is a prediction.
I think this because she assumes this because her mother was a music teacher. She predicts that she will be an amazing singer because of genetics, but she may not be, making this a theory. This is also something you cannot really prove because people cannot say 'who is the bets singer in the world' since there is no statistics against 'good or bad' singers.
Hope this helps! :)
