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I haven't read all this as I am short on time (rewarding myself for wading through lots of client reports with a little look around PF ) but just skimming the original post and I see that you own a juvenile giant breed, of a type that is difficult to socialise and has been selectively bred for independence, who has bitten and broken the skin (at least delivering a Level 2 bite) - this is not the place that you should be sourcing advice.

This dog requires a veterinary evaluation and a behavioural eval asap.

All confrontational interaction must STOP now. Have her wear a house line while supervised so that you can move her if needed without having to touch her.
Use diversion to get her to move or to break up tense interactions by tossing food in the other direction etc.

The behaviour that you are not hesitating in responding to is likely distance increasing signaling that your dog uses to ask politley for relief, time and space in a situation that is too much for her.
If this signaling is not responded to appropriately or indeed punished (which may be the case here) it becomes useless so she will move onto more escalated signaling in stressful situations. This is what makes confrontational interaction soooo dangerous, especially in situations where dog behaviour is misinterpretted and misunderstood.

Please get professional and qualifed help as soon as possible.

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Anne, owned by Rufus & Tripod

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"I've seen a look in dogs' eyes, a quickly vanishing look of amazed contempt, and I am convinced that basically dogs think humans are nuts." - John Steinbeck

"If you don't want your dog to bite you, don't be an a**hole to him." ~ Dr. Ian Dunbar

1. vet - medical - however given you said cant afford... hm.
2. could be pain aggressive.
3. sounds a hell of a lot like dominance aggression. (very very rare type).
4. muzzle
5. food. lots of it to keep the dog busy.
6. ignore any aggression to you. no reaction. (hard if they bite you - so you need a muzzle!) .
7. get some pro help. (wont be cheap!)
8. ignore the dog.

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Cambridge Dog Training School | G3 Dogs
www.g3dogs.com