Continuity mistake: When Andie goes out to get the oxygen from Daedelus she cannot reach it because her helmet won't let her through the structure of the space station, so Max offers to go and help her because he is smaller, but the only suit they can find is an adult one. After a lot of struggling they manage to make the suit smaller and he fits through the structure to get the oxygen but his helmet is the same size as Andie's so although his suit was smaller, he should not have been able to fit. Also notice how long her belt is when Max emerges from the ship. She would have to have about 30 ft of belt to wrap that much around him.
Continuity mistake: When Kevin and Kathrine go to the launch pad we see the shuttle on the pad all lit up. When the camera zooms out to show us Kevin and Kathrine in the Jeep, the shuttle is no longer on the launch pad.
Continuity mistake: When the shuttle went into a flat spin, as Katherine is trying to stabilize the ship, the circular motion is forward, but then they show the shuttle spinning side to side.
Answer: Not necessarily. The 3 G's pretty well kept her pinned, so she wasn't bouncing around. If someone can fall 18,000 ft out of an airplane with only a sprained leg (one of several examples) then yes it's theoretically possible. If the guy in this story could withstand 42 g's strapped in, the yes Katherine could've survived 3 g's.
Https://www.pbs.org/wgbh/nova/article/gravity-forces/.