Mate to who

For years, Fiona a 19-year-old girl, wanted nothing more than to be claimed by her mate, not just a mate, one who loved and worshiped her like a queen even if he was not an alpha. That didn't happen, she was like an invisible object and to make matters worse, at nineteen, she hasn't shifted. 
But will her miseries come to an end, when all of a sudden, she becomes visible to the Alpha's two sons, one a warrior, who is her best friend, and the other the alpha, who is the brother to her best friend? Who will be that dream mate? Mate to who, whose mate will she be? And not just her mate but her one true love.