Don't agree with you. the few dialogue she had was one of the best things of the movie. beating supes speech was great and she delivered pretty well.
I have to say she is one of the best things about MOS.
But I agree with you completely!
From my POV as a viewer, she was more than outstanding in it, and just a quick search on the net and social networks, show she was one of the most talked about from the film, and even the people at DC seem to know that have brought her character, Faora, back to the new Superman/WonderWoman issues and all.
But I meant from a more technical POV, there is no doubt that even casting agents would agree she did great with what she was given and she even managed to get attention from it, but she has been around in HW before giving auditions and in a German interview she said herself that the accent was her biggest issue and she worked with dialect coaches, so a few sentences in MoS were not helping her to prove how she could do with longer speeches regarding her accent, which is why I believe her management made that reel for.