Seta's Fall. Blood Revelation, #0.5

The Blood Revelation Prophecy: Vampires, witches, and shifters will band together to stop the darkness from winning, until one warrior is born to save the world from Satan's wrath. Before she was the baddest vampire-witch to ever walk the dark streets of America, she was a young Spanish servant in Rome, unaware of her own power. Seduced by Count Roberto Garibaldi and having been promised to wed, Seta gives birth to his son only to find out too late that she had been used to produce the heir his barren wife could not. The count steals the child out of her arms, beats her, and throws her off the cliff just beyond his castle, but Seta's fall does not lead to death.
A guardian has been sent to save her by giving her a second life, a life hidden in shadow where she can not be with her only child. Seta must suffer the estrangement from her son until he is old enough to be reunited with her and revenge can be taken upon those who stole him, and she must wrestle with the attraction she has to her sire, a vampire who gave her a new life, but could just as easily take it away.