Okay, so just been looking through my reviews and just realised I haven't really answered any of your questions so here it goes!
WinchesterDixonBros: In 1864 Katherine had a hard time trying to get Damon to forget about Alex, she tried not using compulsion at first but then she realised that Damon loved her so she used compulsion. And also, Stefan was too preocupied with Katherine and Alex felt loneley she didn't really have anyone there anymore, so eventually she just left, because she felt too alone.
MrsDamonSalvatore: So, Alex isn't a Original, but when the Originals went on the rampage killing everyone in their village, Klaus turned Alex because he liked her and it was kinda over before he knew it. And he didn't know what he had done, so he just left her. So when Alex was in transition no one was there for her, apart from a witch who gave her some deer blood to become a vampire. I'm not sure if vampires in TVD can actually do that. But I did so I could write Alex's story.
Also. to the others that have reviewed thank you so so much! You are all amazing and I really need to visit your page so I can read you fanfiction, but right this second I wanted to thank TinyDancer365 because I think she is such an amazing writer and if you haven't heard of her read her fanfics there are (excuse the language) fucking awesome! Not that the rest of you aren't so I will get reading ;) And be sure to exspect a review from me :)
Also, feel free to ask any questions if you are curious and what not also, thanks for all the reviews saying that you liked Alex and Elijah's relationship with each other, I'm not sure if I want them to have a 'friendly relationship' so for now I made them quite good friends. And like a few of you said they are very comfortable with each other.