I guess this is where we get to learn how to let go, for real.
I wouldn't want to be OW, she'll never be able to trust anyone because she knows exactly what deceit and dishonestly looks like and feels like.
Most likely (unless she's settling in for a whole lifetime of whoring around, she's so young after all) she'll often have nagging doubts about her partner, because she knows the other side.
Whatever I would wish upon her, it's not going to happen. So I try not to obsess.