Non-crewmembers are not obligated to get a an examination but if they wish to remain on the ship then they will have to.

Our ship has just finished engaging an enemy ship that was attacking the planet (orbital bombardment and sending down ground forces) and the enemy was forced to retreat thanks to our efforts. However, there are some injured people and some people might not have gotten onto the ship in time because it was blocked off by the enemy. The ship is landing to pick up the stragglers and do medical checks on everyone. Your character could have been left on the ground during this time if she will enter at the end of this episode 1, or if we go into episode 2 she could be among the people we recruit to make up for casualties.