More fuel was being used up faster because the additional weight of the stowaway away. The EDS is only given enough fuel to make it to its destination by computerized layout. When the EDS goes through the planets gravitational pull. The weight that is there will increase in heaviness. Marilyn's 150 pounds would increase to about 550 pounds therefore the fuel will burn faster and the ship will plummet to the ground and crash.
The mission to Woden was jeopardized as soon as Marilyn stepped foot into the EDS. Marilyn weight made the Burn more fuel. And for that the EDS could crash and the Kalar Fever Syrum to the people who are sick down on Woden and they will die and so would Barton and Marilyn. So the mission would be unsuccessful.
Barton is forced with a hard decision when he found a stowaway, and that the stowaway is an 18yr old girl. It made it hard for him to annihilate her, he knew he had to he just delayed a lot of time for her to be able understand with in her last moment of life.
She got in contact with her brother and wrote her family a letter. But by the time it was time for her death she understand it was her life not by her decision but by an equation.
Barton was called upon a lot trouble personally he knew he had to but he didn't want to he wish he could of actually done something to save her. Her brother understand why right at