GWAR said: You are stupid! It's the ultimate deck!
Learn the rules before you make accusations. You can't have more than three of the same card in your deck so if she only has lots of the same card, she can't make a legal deck. The fact that it's all of a fusion monster makes it worse because fusion monsters require other cards to be summoned. Of course, it's possible only the cards we are looking at are the duplicates because if you look at her duel disk you can see a deck in it.