Translation:Or does she like oranges more than apples?
Not quite, rather "Does she prefer oranges to apples?" the question implies that we already think, that she likes oranges better, but we are not sure. it's subtle, but there's a difference. your question would translate to - Mag sie Orangen oder Äpfel lieber/mehr?
to be honest, i'm not sure if I'm making any sense here ^^ your translation is correct, so don't worry too much about the explanation above.