Honestly - If it could still breathe, I would just leave it there until it stood up and stood for a little while, then untie and let it go.
Been there done that too...sometimes with one that pulls that violently that may be the best solution for it...she's obviously figured out at some point that wigging out when she's tired of being tied, gets her UNtied!
Now you could start teaching her to ground tie, and working back up to solid tying, but with one that violent, I think she may just have to figure it out for herself again.
You could use a neck rope, and tie your lead to it, and run the lead under her chinstrap on the halter, and tie her with that. Make sure what ever you tie her to is strong enough to withstand her freakouts, and try to use a rope halter, and solid lead rope...hardward is easy to break, and because she has an affinity for breaking that stuff, it's best not to until she figures out this tying thing again. I like to use a high line too, but that can be a pain, if you don't have an eave (solid) in a barn, that you can tie to. You just tie a good solid rope to a heavy inner tube that is looped around the eave, and tie her to that. You should always tie atleast at mid shoulder level, so she really can't fall over, just back up.
Another solution would be to teach her to hobble. That way you don't really need to tie, all the time.
And you could try the blocker tie ring, but some horses seem to figure out if they keep going back, they can eventually untie themselves with that too.
There are many ways of teaching a horse to solidly tie, but those above are the ones I personally will use.
But the reality of it is, that you may not always have access to hobbles, or an area that you would be allowed to use them so retraining her to accept being tied until YOU say so, is the best option. I know alot of trainers who will simply tie a horse to a solid, safe area, and leave them there for hours...if they goof around, they can't get hurt, but they aren't getting away either, nor is anyone going to 'rescue' them just because they want to be off the lead. It does work, and if anything teaches the horse an extreme amount of patience.