I just typed out an excellent (in my mind) post on possible causes of Izzy's issues. Then my browser somehow magically closed out the tab and ate it. I'll summarize what I said.
There are 6 possible categories of problems that could be causes our complete lack of forward problem, listed in the order that they occurred to me.
1. Saddle fit.
I absolutely cannot afford a new saddle again. I'd love to see how she'd go in one of the new ansur models, particularly the new konklusion. Alas, I don't know anyone who has one, and it's so far beyond my price range that I can't even see it. I can play around with creative padding options. The advantage to being at a boarding barn is there's lots of stuff around that people are fairly willing to lend to me to try. (Yes, I'm one of those who always asks first.) Ansur also makes a special pad that might help for about $80 and skito pads (which I have no experience with) run $110-$170 for what I want. I'll probably inquire of treeless people on this option. Ideas, Jean? I'll query the ansur group, too.
2) Chiropractic Issues
Another expensive but important option. Thanks to Nina for her updates on Sam's progress in this area. It would be easier for me to swallow if I knew Izzy had done something, tweaked something, or, you know, if she just came out and said, "I need to see a chiropractor." Cuz if she said that, she can have all the fancy crap she wants. You know how much money I'd make, exploiting a talking horse? Mooooove over Pat Parelli. Haha! Alas, her vocabulary is currently limited to horse, which makes this difficult. We'll give it a go and hope for improvement. A very expensive go. $120 for an adjustment. Oh well... Car gets an oil change, Izzy gets chiropractor, and I'll wear dog chewed shoes for another month or so. At least I bought my husband's birthday present a month ago.
Kate has some experience with ulcers in her own horses, so she's presented this as an option. We have a couple boss mares with ulcers. I don't really think this is it, but of course, it's possible. It's certainly something to keep in mind. If saddle and chiro work don't change anything, we'll try this next. I just don't want to do everything at once and then not know what worked. It's a bad research model. ;-) That's my inner nerd coming out. In the mean time, I'll do a little more research and see what I come up with for pasture-kept princesses with attitude.
4) Mental/issue or boredom
This is possible. I don't know about the likeliness. If this was it, Izzy would show improvement after going out on the trail, and since I haven't been able to ride, I haven't been able to evaluate this. I guess it's possible, but I don't think it's likely. Izzy not a hard keeper or hard to please. She's pretty happy doing what she does, until she's not, and then she lets you know in a big way.
5) Training problem
Again, this may be it. I don't want to rule it out, but I want to look at physical issues first. The rearing under saddle wasn't a training problem per se, it was her telling me that her saddle hurt and she was absolutely not going to work like that anymore. She hasn't even thought about rearing since we switched saddles. On the other hand, the rearing on the lune line was absolutely a training problem. We have worked through it and I doubt it will come up again, as she doesn't like to work that hard if it's not going to get her anything. So... this is a mixed bag. Maybe, maybe not. Time will tell.
6) Soundness/soreness problem
The problem pony is sound. She's been sound. Her feet are beautiful, or at least as beautiful as a warmblood's feet can be. She moves well on her own and on the lunge. Her back certainly isn't sore--her favorite thing in the world is a good back rub. I don't think this is an issue with us, although it would certainly explain a lack of forward, especially in a mare with a princess complex.
Any other ideas? Let me know. I'll certainly keep you updated on our progress.