It bothered me so much in Avengers: Infinity War that just when they were getting the gauntlet off Thanos, Nebula revealed that
Gamora was killed by Thanos
I get that it's emotional outburst and don't want to sound insensitive but she could have waited to reveal this until after the gauntlet was off Thanos' hand! It was just convenient that what she did was a sureshot way of emotionally derailing
Quill and the others
thereby giving Thanos a chance to get his Gauntlet back.
Also in the beginning, when Nebula is being tortured by Thanos, just right after the place where the soul stone is kept is revealed, she manages an escape. I feel she could have escaped earlier if she tried to.
So is Nebula actually helping Thanos get the all the stones? She seemed so, so sketchy! Is there any genuine source that can shed light on Nebula's actions?