I would combine the two:
During WWII,?after?her submariner husband is called to battle, Jaynie struggles to survive the siege of Malta and Nazi invasion. Young, pregnant, and a newlywed, she must save her family on her own..
More details are need though.
"Struggles to survive" is too vague. While the invasion is a conflict within itself, you need something more specific. Does she have to hide? Does she have to flirt with Nazi soldiers? Does she have to steal food to keep from starving? What's the struggle?
Also, what "family" are you referring to? Her unborn child? Her parents and siblings? If her husband is gone she doesn't have to save him. Again, be specific with the details and how she "must save" whomever the "family" is.