Couldnt find it. I believe it may have been thrown out :(. I went searching and found some "herbal remedies" that may be of interest.
Scullcap- for anxiety/nervousness.
Aromatherapy- NONE of these should be taken internally btw. Try washing her with Lavender scented shampoo(not sure if there is a horse wash like that). I have used Ivory Body Wash on a horse before when needed with no problems. There is a Lavender scented Ivory body wash. Be very cautious. My horses never had any problems with it but try washing a small area just to make sure first. Wait a few days and monitor the area. Make sure you rinse thoroughly. Try Tea Tree Oil wash. Its all natural. People use it to get rid of head lice but I've seen horsemen use it to get rid of "parasites" its also a relaxant.
There is more, im still searching
Try contacting your vet and if possible see if you can arrange for your horse to get accupuncture. I use to work at a stable with a psychotic 30yrs old gelding. (oh yes he looked his age as well). After about a month and a half of accupuncture he started to calm down. Also talk to your vet to see if they know of any "equine safe" remedies to "calm down" a horse.
Remember its probably just your horses personality. I've owned horses you could have sworn were possessed but no matter what, that's just the way they were.
Try leaning towards more "behavioural" fixes rather than "medical". Try some Natural Horsemanship (go to youtube and type in names like Clinton Anderson and such). Stuff that makes your horse think and work but LISTEN to you.
Hope I helped :)