Hoookay... I'm going to do a list, otherwise I'll get lost.
1) HAF, could you please use punctuation and separate your thoughts into paragraphs? It will make your long posts 100% easier to read. I am interested in your posts, and want to help, but my eyes went crosseyed with this one!!
2) Alright, with the taking off thing: work on your one-rein stops. At a walk, ask her to circle smaller and smaller until she halts, then release the rein and praise her. Once she is stopping easily at the walk (with one rein) then move on to a trot, and circle her until she walks, then circle her to a halt... you get the idea.. do this until she is stopping really easily and well from a trot, then you can move up to the canter.
That way, if she ever takes off on you, you can do a one-rein stop. You can stop almost ANY horse using this method. Remember, a horse's neck will always be stronger than your arm, so just pulling back with your hands won't stop a runaway. If she gets really out of hand, then drop one rein and pull as hard as you can backwards towards your hip, so her nose follows that pressure and she'll follow that into a spin, which will stop her forward motion - you have to be ready for this though, or you might get tossed in the sand.
3) I'm sorry, but playing a few Parelli games does not necessarily constitute good groundwork. If you're playing them consistently to build up a good base, then yes, but just going out one day and deciding to play a few of those games does not - it takes weeks to build up a good groundwork base, a weekend won't do it.
Personally, I like to get a horse going well on the lunge, then I ground-drive them at a walk and trot, and do a ton of circles so they know what the reins mean. I toss in a few verbal commands ("walk on" "trot" and "whoa" are extremely important).
Choose a method, then employ it for the next 2 months - every time you go out to do work with Chance, do groundwork. Forget riding for a little while, obviously she doesn't have the right kind of respect or training to do that right now. Take it back to square one.
4) Rearing: if you're circling them (as in turn on the forehand kind of tight, not 20-m circle kind of tight), they CAN NOT REAR. Turn her in a tight tight tight circle and make her whip her little but around so fast she doesn't know what's happening - they don't like the extra work, so they will think twice about rearing as they won't want to do the extra work associated with this. Turning her in this tight forehand circle will make her unable to buck as well.
5) With young horses you have to be patient, and always be ready - that means being viligant at every moment that you are on them. You can't think "ok well they're going well, I'll just relax" because they might spook at that next scary shadow (yea, the one they've walked by a million times, but THIS time it's scary!) and you might get dumped in the dirt if you're not anticipating it. The fact that Chance got the better of you the second time around was your fault - "fool me once" type thing. I'm sorry if this sounds harsh, but it's a reality in training young horses... and I will be the first to admit I've done this many times!!
6) "i even did things i feel sooo bad about." - like what? Again, back to the green horse issue... you have to be able to deal with things calmly and efficiently. If they do something wrong, you deal with it then move on. You can't linger on things - they don't understand. For example, if your horse cow-kicks out, you have to deal with it (kick them forward, for example, or turn a tight circle, just something to punish the action with more work than the action was really worth) and then move on as if nothing happened. You can't stall for a moment then beat them - they don't understand, because the moment has passed, and they will think that what they did after the kick is what you're punishing them for. Another example, if you get bucked off and you go and get your horse, DO NOT hit them, even if you really want to - they will think you're hitting them for letting you catch them.
7) If you're lunging a horse, they should not be able to turn in and charge you, especially if you're completely in control. If nothing else, step to the side and make them work hard around the circle - it's rediculous that a horse would be able to charge you when you're controlling them on the lunge.
Okay, I can't think straight anymore, here's my conclusion:
Honestly, Chance needs to be taken back to square one - groundwork. The stuff that makes her accept the bit and moving awa from your verbal commands, and do basic movements while ground-driving. When it comes to being ridden, Chance needs a very strong trainer who won't let her get away with anything and knows how to deal with situations (rearing, bucking, spooking, whatever) cleanly and then can move on.
It sounds like you really need to consider whether or not you can be all of this to her, HAF. I'm not trying to sound mean, I'm being realistic. I know you like Chance, but can you handle her? Can you take her training back to where you consider her unbroke and build up a solid base? Can you react calmly with her? Can you know what to do when she rears or bucks or spooks? This means that you have to know how to stop her from rearing or bucking.
Most of all, HAF, I think if you are going to continue onwards with Chance, you need to get a trainer. If you don't like the one you're with, then find another.
Okay, my head is spinning, that's a long post to try and digest and reply to!
The lovely images above provided by CVLC Photography cvlphotography.com