It seems like she meant to say that it is wrong not to give that credit, i.e. it is not just a good practice, not only a moral obligation that you become only i

It seems like she meant to say that it is wrong not to give that credit, i.e. it is not just a good practice, not only a moral obligation that you become only immoral for not complying, but a requirement, a must that if you do not do it, then you are in the wrong.