Is your DD usually manipulative and prone to winding you up?
If not why would you come to the conclusion that she is avoiding checking her degree result to wind you up?

Why is this all about you and your "rights"?
If my DD shut down, hid away, wouldn't check her exam result days after it was released for an apparently silly reason like lack of wifi, I would be bloody worried about her!
But you are prepared to forgive her
if its true she doesn't have wifi (so if there is another reason, such as her being terrified of disappointing you or having a mini or not so mini crisis or break down because of her perceived failure or fear of having failed you won't forgive her presumably), you are upset, you have paid out good money and know your rights (I think you mean she has a responsibility to tell you, not she has a "moral right to tell you" - obviously she has a right to choose whether or not to tell you, and you think she has a responsibility to tell you...).
I am still wondering why you have expressed no concern for your daughter in all this and feel it is all about you, your rights, your upset...