Book where a human can see 'invisible' creatures (maybe vampires). She also has a high level of magic and falls in love with a strong leader of the different race.

[Makynna]

She can see the creatures, may mention something about shadows. She ends up in their mansion which goes under attack and discovers she has the strongest level of magic (may be white level?). Also, the creatures have an extremely hard time reproducing so they have a weird view on sex/relationships. On the series covers it looks like the males have marks/tattoos that glow. Read in 2012.

[Brittany]

Could it be Blood Shadows by Lindsay J. Pryor?
'Gifted with the ability to read the shadows of ‘third species’ beings, Caitlin Parish is the Vampire Control Unit’s most powerful agent.'

[Mia]

Were you able to find the book?