I'm really sorry your macaw ambushed you.

I've never had a bird larger than a Poi mainly because I know I couldn't stand the bite of anything larger. I can't imaging what it's like to be bitten by a macaw.
It's spring so your bird is probably hormonal which could be why she attacked you. I know that sexually mature macaws in particular can be
extremely aggressive when hormonal.
The good news is that Avicalm can help with aggression. If you use Avicalm for a few weeks and don't see any improvement you can try the Rescue Remedy and see if that helps.
I'm sorry you have no support but I'm glad you're at least posting on some forums to try to get advice. I know it's not the same as having someone there with you but hopefully it helps a little bit.
I agree that the current state of aviculture in general is horrid. Most people have no clue what it's like to own a bird and the larger the bird, the bigger the problems.
Some breeders are very responsible and require their prospective clients to thoroughly educate themselves but I think those are few and far between. Pet shops are even worse. Statistically the average parrot goes through five homes in its lifetime, which is horribly sad. One of my parrots is a rescue and the other is a re-home. I could get off onto a whole tangent about the practice of keeping birds as pets but it'll just make me angry so I'll stop here.
I know you want what's best with your bird and I can completely understand how you're at wits end right now but the bottom line is that it would be very hard to re-home your bird in its current state---a plucking, aggressive macaw with a beak large enough to crush finger bones. Honestly you'd probably be hard-pressed to find a rescue as well because most rescues are already overflowing with unwanted birds with extreme behavioral problems.
Please don't underestimate clicker training. The cost is minimal: a clicker only costs a few dollars and you can use a chopstick as a targeting stick. It might seem at face value that teaching your bird "tricks" has nothing to do with addressing severe behavioral problems but the truth is that's the best way to address the problems you're having, period. It's not about the tricks. It's about building trust with your bird and teaching it new, desirable behaviors that it can then substitute for undesirable behaviors.
If you use positive reinforcement to reward a behavior, that behavior will increase over time. The more the behavior is rewarded, the more it will increase. That's called operant conditioning and it works. It not only works, but it works well and you will see results very quickly. Once your bird learns a few simple tricks it will suddenly have something to do other than pluck and bite, and it will offer these new behaviors because it knows that if it does, it will be rewarded.Basics of Parrot Taming and TrainingIf it comes to it (due to aggression) you can even teach targeting from
inside the cage before trying it outside the cage. You can also offer the food reward from a measuring cup on a handle if you're afraid the bird will bite your fingers when you offer a treat.
And hey, if worse comes to worse and you have to re-home your bird at least you can "advertise" the fact that she knows some tricks.