it is not wrong.
it is her way of telling you she does not want to go out with you anymore.
she does not have to 'validate these reasons' - she doesn't want to go out with you and she doesn't have to.
she said those things to spare your feelings.
she could have said a lot of cruel things but it sounds as though that although she doesn't want to go out with you, she does not want to hurt you either.
she is trying to be kind, a bit misguided maybe, but i assume you are around 14-16 so you can't expect her to know exactly the best way to do these sorts of things.
move on.