How did Shaw get up there?

Don't you remember how they got onto the bridge? Part of the tunnel system in the dome led directly to an airlock door. Presumably something like the 'airbridge' or 'jetway' tunnels that people use to board airliners. When you're no longer at the terminal, the first step is a lot higher!

But Shaw enters the Juggernaut after it crash lands, so that first step has to be high also when entering.

Hadley's Hope - Yes, but at the end of the film the craft has crash landed. No way to access any tunnels. The point stands: Shaw exits the craft using a doorway/portal so high off the ground she must repel down. Are we to assume she pulled a Michael Jordan and jumped up there to get in?

@Squibby, normally I wouldn't think Shaw able to perform a Michael Jordan, but you have to concede that after having implanted the empowering staples in her belly she might as well have gained some superpowers.

this didn't bother me...you can assume she found an entrance into the ship somewhere at ground level, made her way to the cockpit, and rather than carrying David's head and torso back down the way she came up, rappeled straight down from up there.

As I recall david yelled at Shaw that he was 'over here' when she first came on the Juggernaut. I don't think that there was a side, gaping hole to rappel down. The Juggernaut might no thave been detroyed in the crash and timble to the moon's surfacve' but it did bounce around enough to cause an entrance somewhere where she could enter and find the head, so to speak. In her walk through the Juggernaut she could have seen different areas of the ship not apparent in earlier scenes. It is kinda funny that once she and david hooked up there was not much talk ofShaw's physical condition. It was almost like she healed up after thinking everything has been a waste and lying on her back hears david's voice. She became all gung ho and easily lowered David's body and head. She was motivated for the next adventure. Even david should be hesitant to take Shaw on. She wants answers now. Could Ripley have done any better than Shaw?