Rachel and the Viscount — Alanna Wilson

Rachel, good friend of Tess Mainwaring, has returned from the Crimean War to live with her aunt and uncle. The sudden death of her uncle leaves herself and her aunt destitute. They are offered the use of the old Dower house by Justin's parents the Earl and Countess of Cumnor. Once again she meets Justin Mainwaring and tries to hide her feelings for him.
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UK Edition:

If all the young ladies who yearned after handsome Viscount Mainwaring were laid end to end, they would reach John O'Groats. And so Miss Rachel Irvine, plain, penniless and recently returned from the Crimea where she had been nursing with the Viscount's sister, rebuffs his friendship at every opportunity. For it would be too easy to fall in love with such a man - and Rachel knows that in the eyes of his family she could never be good enough for him...