ElanTia (a novel) by O'Rangia J. Taylor

Unemployed and pregnant with twins, Dyanna Carter is determined to create a good life for herself and her unborn sons, even though she has no idea how. The last thing she expected was to wake up in a hospital on a spaceship, with everyone telling her that she's the Queen of some alien empire and the ElanTia, the prophesied Daughter of the Almighty God. Or for the alien Holy Council to decide that she's going to save the universe. And she definitely wasn't expecting the tall and handsome Captain to suddenly say that he's her husband. 

Now she's trying to learn new languages, and politics, and feed the starving, and get medical help for the sick. And just when it seems like all the power they've given her is paying off, members of the Holy Council start dying. When there's an attack on her life, the aftermath is devastating.

Surrounding herself with her new friends and family, she has to wonder, can she actually be the Queen they think she is? Can she actually save them all, and create the life she's always longed for?