Thanks for the suggestions! I very much appreciate them all!
My suggestion, is call smartpak tomorrow and talk to them, see what they say.
I'm kind of scared of calling them since I'm basically the most gullible person ever, but I will give it a shot tomorrow. I'll just report back with whatever they recommend and have you guys make sure they aren't pulling my leg.
How old is she?
I have had good luck with Corta-Flx with added MSM. MSM is cheap by itself, only $8-12 a month to feed. I add a 1/2 dose to a full ounce of Corta-Flx. bigdweb.com has the best prices on Corta-Flx and the gallon is very affordable per-month. I have a $10 off coupon floating around if you want to order from there.
As far as "mareness," I would really consider her overall diet. My mare got a LOT better when I pulled her off all grains and feeds containing grain products. Her diet has no corn, barley, molasses, wheat, grain by-products, etc. She gets 1 lb of chopped alfalfa hay, 1 cup of oats (for fun), 1/2 cup of ground flax, and a vitamin/mineral supplement, with free choice grass hay.
Feeds that contain anything I mentioned above, or any feed that is "high starch," can have a negative effect on a horse's behavior, especially one who's already prone to hormonal issues, at least IME. Also, high calorie and/or high start hays or grazing can also effect behavior. Some horses have a sensitivity to alfalfa hay, so if they're fed more than a couple of pounds they can act quite hyper.
Turnout time also plays a big role in behavior. Horses need room and time to run off pent up energy. They need at least a 100x100' area (per-horse) for at least 4-6 hours a day. Some horses need even more room and/or time outside. Personally, I prefer my horses out 24/7 with just stall time for feed. They have shelters, trees, and blankets during the winter. We have very little lameness trouble, (knock on wood) NO colics in YEARS, and no other real illnesses. Horses that live outside (with adequate shelter and footing) tend to be healthier, body and mind, than horses that spend any sizable amount of time in a stall.
Once you have her diet as calm as possible and on as much turnout as possible, then you can consider adding a calming supplement. If the mare magic is working, I wouldn't change. You might be able to buy bulk rasberry leaves online cheaper though. That is all that mare magic is.
The only things she's on right now are 1lb of Purina's Enrich 32 (it was the only ration balancer available through my feed store), 1lb of beet pulp, about 7 pounds of alfalfa a day (I'm slowly cutting this out as the grass grows in), and unlimited grass hay, plus one of those wafers and the Mare Magic a day. So I don't think there's anything in there that should make her hot.
And she's hot whether she's on alfalfa or not (actually, when she's eating straight grass hay, her head goes through the roof), and even when she's been on timothy hay and a dry lot, no supplements (last summer at camp), she's hot.
She's also on full turnout. She's never locked in. She has a three acre pasture all to herself that she shares with two llamas.
I've been trying to get her exercising more to burn off some of that energy and so far this week I've gone on two 2 hour trail rides (mostly walking, some long trotting and long cantering) with her and I've lunged her everyday that I haven't ridden her. Hopefully I can keep that up in the coming weeks (I'm on spring break right now, school starts again next week), it's going to be my goal to keep it up.
I'm definitely open to suggestions about her diet and exercise. The one thing I can't totally change is the alfalfa. The llamas she lives with have to be on alfalfa (per their owner) and Lacey will steal their alfalfa if she doesn't get hers. However, she is actually calmer on the alfalfa than she is on most other hays so I don't think cutting that out is the ticket anyway.