I know it seems impossible, but please do try to stick it out with Luna. You have gotten some great advice here and there really is an end in sight.
My Morgaine was also a Molotov/HBs Commander girl who looked just like Luna and her SA was just horrible. I had no clue how to deal but was given a great deal of wonderful advice from some amazing greyhound people. It took time but she did calm down.
Alone training -- every day, 3 or 4 times a day. I could be found sitting in the hallway on the stairs for a few minutes at a time. She got used to my going in and out.
DAP Diffuser (pheremone therapy) -- we called it Plug in Mommy, it worked great
Rescue Remedy -- in her water and a few drops under her tongue
Finally, what worked best was realizing that her melt-down point was at the 4 hour mark. That is when I got a dog walker. A good dog walker (the first one was a useless excuse for a human) who walked her, tired her out, and then didn't leave the house until she was settled on the couch with her cookie. She did all of this in the 30 minute walk time!
The last thing that really helped was to take therapy dog training together. It could easily have been obedience class, just having the time together to work on skills for her.
This was a dog who ate through my plaster walls, who ate through part of the kitchen counter, a wooden credenza unit, part of a bookshelf, a case clock hung 5' up the wall, the wall around my door, etc. She wasn't bad or destructive, she just wanted to get OUT and get to me. Once it all fell in to place, she calmed down. It can happen. It just takes a whole lot of patience and work.