The Gifted mate

Mel is a Single hard working mother.
She split from her husband taking her son and her dog she leads a mostly quiet life.
One night after work she takes her dog for a walk to find a young man all bloody and disheveled asking for help.
Mel takes him in even though she just saw him change from wolf to man.
As he waits for his Alpha (his brother) to pick him up he finds out Mel isn't just a human but rather gifted herself.