Ground Control by K A Hough

"There's No Going Back"
Fifteen Years ago, Sarah was a biology student with a lot of potential. Since then, she's been drifting from city to city, leaving behind friends and family to follow her ambitious biologist husband as he rises to the top of his field. 
"We're going to Mars." 
As she packs up to follow him again, this time on a one-way mission to join the growing colony on Mars, Sarah struggles with the choices she has made in her past and knows she must decide what she really wants. 
When an unknown threat jeapardizes not only the people aboard the shuttle, but the very viability of the Mars program, will Sarah find the strength to finally be true to herself, or will she lose everything ... again?