@SassCatt I think that the way you threw Alydia into the story was very hunter-like :)
But, if you want to start again from Season One, it would also be really cool because I would love to see how she accepts the vampires and such, and how she reacts to the other supernatural creatures...
But, instead of writing a new story for the beginning of her life, maybe you could add them in flashbacks or dreams in the story you're writing...
I hope that helped :) Update if you want :)