Diana's insanely talented in terms of skill in combat, but a random encounter? With the extent of Beck's illusion tech, she'll be thrown off for a good while, which is all he needs to gun her down.
Also, if the whole "illusion then headshot" plan seems strange, then Beck could just easily use his drones (which number in the thousands, may I add) to fire at her from every direction and eventually gun her down. The minigun fire of each drone and the amount they carry is a decent amount as well.
Diana has no pre cognitive abilities, and no way to predict reality from illusion, which can only mean disaster for her, sorry to say. This is one match where the LA guy wins.
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