The Hartwell Sisters Saga Series Novels

Omega's Dream (The Hartwell Sisters Saga 4) by Flora Quincy
Omega's Virtue: Part Two (The Hartwell Sisters Saga 3) by Flora Quincy
Omega's Virtue: Part One (The Hartwell Sisters Saga 2) by Flora Quincy
Omega's Gambit (The Hartwell Sisters Saga 1) by Flora Quincy