Third Chance Mate

A third Chance Mate is incredibly rare in the werewolf world, and it had never been heard of before.
Astrid is a young girl who has been abused by her parents, and her pack may be treated worse than enslaved people, while her brothers are lavished with everything.
Astrid had always wanted to marry the son of her pack's Alpha. She has been drawn to him since they were children.
Astrid grows up hoping to be his Mate one day.
Fate conspires in her favor, and they are fated to be mates, but he rejects Astrid as soon as he learns of the circumstance.
Astrid is distraught and believes she has no way out of her situation. There is still hope that she will find her second chance partner, but after a few days, she begins to feel misery, the kind of grief that only comes when a mate dies.
She loses all faith in ever finding happiness and accepts all of the calamities thrown at her, believing she deserves everything.
She becomes aware of the approach of something peculiar one day. She feels a connection with someone who is facing away from her and realizes he is her third chance mate.
She wants to approach him, but she is afraid of being rejected again, so she runs before her Mate even realizes who she is. Was her decision to depart the right one? Is it feasible that this may turn out to be her worst mistake? Because she had been assigned the Vampire King as her 'Third Chance Mate.'