I'm not saying that technology is 100% perfect, but I watched the double of Juvan/Zidansek vs Hradecka/Bouzkova and in the tie-break there at like 1-4 she did the same thing, complaining about a decision made by the umpire (they did have no video proof there). Maybe it's just to make her feel better as in "it wasn't my fault I lost that point". After the match she said in an interview that the others were simply better at the end.Misaki is playing amazing right now, it looked like she got broken when serving at 5-3 (both players begun their walk to the chair), but hawk eye shows the ball a mm in. Juvan, however, is still adamant during the changeover that the ball was far long. 6-3 for Misaki now.
You forgot to mention that she successfully returned the ball, but also vocally called for the hawkeye. She could have continued playing that point if she had not called in the hawk eye and potentially won. I'm not even sure she "complains" on purpose, she is a nice player it might be just unconscious to keep morale up and stay in game and redirect the blame from herself.