I am sorry, this is the answer you do not want to hear. If you cannot get professional help, SELL THE HORSE.
YOUR life is more important than ANY horse. There will be another horse. There will not be another YOU.
Yes. That is why I do not get on "rearing horse" threads with advice. Rearing is a deadly habit and you can die, be paralyzed etc. I am not talking about the rare situation where a horse rears out of sudden fear etc... I am talking about habitual issues. Lean forward or bail.. give the horse free rein.. if your horse rears. That is a riding skill. FIXING rearing is a training skill. Those two things are different.
The internet is not the place to get advice for habitual rearing.
As much as this will sound like one of those immature responses but she's not getting sold unless some majorly hefty circumstances were happening. I don't see any reason that someone who does know how to deal with it (like a trainer, or something) couldn't tell me the best way to go about it instead of immediately "sell your horse." That doesn't ALWAYS have to be the answer. I mean, how does a trainer learn to deal with rearing? By having someone tell them how.
I guess it really depends on the situation to make an individual decision. In some - maybe even many - situations, yes, a trainer would be best, even selling your animal. Heck, a trainer will ALWAYS be best. "Trainer or sell the horse" should not be the answer for every single person who has a horse that might rear, though. An experienced rider might have the ability to fix it themselves, and just need some pointers on the correct way to do so.
I'm having a hard time getting across what I'm trying to say here. That's like saying if your dog snaps at you, either hire a dog trainer or sell it. Yes, dog aggression is hard to fix, and it could even be a danger to yourself. But many people fix it on their own. But if they ask the best way to fix it and everybody says "I won't tell you, sell your dog," well, they're going to get hurt trying to fix it the wrong way.
Maybe that's just me. I'm glad she's a good horse who keeps her feet planted. If you hate the threads offering advice on how to fix it, you shouldn't post about how everyone else is wrong and why, and then not offer something yourself. Even a trainer starts somewhere - if everyone told them to sell the horse or bring it to a pro they wouldn't ever be able to become trainers, then, would they?
I do see what you're saying. Rearing IS dangerous, and I would highly advise anyone who has a rearer to get professional help. But sometimes they can't, and I see no reason to refuse to help because of that so long as the rider is experienced and knows what he/she's getting into. (And I'm really not trying to come off as an ass here, I promise).
And onto the topic - OP, have you tried anything? How is it going?