Assuming that the organization which handles the space-crew in the game is inspired by the real world NASA, if Kathy is to be a part of any space crew, she should fall under the recommended height for required by NASA, and that is 158cm to 190cm. Kathy should not have a height lower or height that this height.
Kathy’s height data in this article is an estimate; it is not the official height data for her character. Her official height data is currently unknown. Kathy’s height in this article was calculating by observing her height scale difference compared to the surroundings which can be seen both in the gameplay of the game and in the in-game cutscenes.
By using this Youtube Video (DELIVER US MARS All Cutscenes (Game Movie) 4K Ultra HD) as our main source of reference in observing the height scale, it can be seen that Kathy falls around a bit taller than the average female height. Additionally, in this Deliver Us Mars | Story Trailer Youtube Video, we can see that at 1:28 timeframe in the video, Kathy stands in frame besides a sliding laboratory type doors. Our research led us to believe that the sliding laboratory door in the game trailer is around the same height as tall glass doors used in several high end apartments, hotels, and malls. According to Glass Doctor, a Two-Panel-Sliding-Glass Door will often have a height measuring between 60, 72, and 96 inches. In calculating Kathy’s height, we used 96 inches as our base for reference. By doing a visual observation on the frames, and by using Hikaku Sitatter Height Comparison Tool, we are able to come up with the conclusion telling that Kathy must be somewhere around the height of 168cm.
This should be a pretty sound conclusion since the actress which plays Kathy in the game, Ellise Chappell, is also pretty close to the estimate height range. Ellise’s height is around 167cm according to this CelebHeights article.