Found by Meg Benjamin

Some think she’s a monster. He thinks she’s the love of his life.
After she sent several men to the hospital, Dame Blanche Eva Winchester is learning to control her power. But she’s also bored to tears. Enter Prince Bertie, who offers her the chance to go undercover as a waitress in order to find out who’s attacking men in the parking lots of Folk-owned clubs. Bertie’s motives aren’t entirely innocent—he’s smitten by the lethal lady’s charms.
But he and Eva discover the attacks are part of a more wide-ranging conspiracy, involving the very survival of the Folk.
As their investigations bring Bertie and Eva closer, Eva finds the downside of dating a prince, even one as yummy as Bertie. But when the prince is attacked, Eva swears to protect him. To overcome a ruthless enemy, the two must stage a last-ditch battle in the blizzard-ridden mountains.
And this time they’ll need more than love and super strength to survive.