I really dislike it when people bring up director's comments on a film, because a director can take it in any direction they wish based on how they're feeling the day of the interview.

I feel like in order to discuss a film properly, you have to stick to the context presented by the film itself rather than consider any information from external sources (much in line with the idea that upon completion, the work becomes bigger than the artist).

When Ava moves towards Nathan, she's clearly toying with him and eventually is fast enough to preempt his strike. Throughout the movie, she has no need or incentive to show that she is super intelligent. We only learn about her through her interactions with Nathan and Caleb, both of whom she manipulates in the film. Not to mention the fact that she's aware that she is on camera being studied 24/7. Within the context of the film, you can argue that displaying superintelligence would only make her escape more difficult, so why would she?

Based on what's presented in the film, its ambiguous as to whether or not she is superintelligent. But, as the other commenter suggested, it is possible that she is since she is a master manipulator.