Be careful about saying you "can't take it." You have very little power here. You do not have legal rights or powers to force your employer to fire this person. And since you have already made your complaints about her, and the employer has not fired her, it is unrealistic to expect the situation to change much in your favor.
Inter-personal conflicts are one of the most difficult challenges faced by employers and many of them will eventually just get tired of the hassle and fire both warring employees. And that is not unlawful.
Your post repeatedly specifies the races of the participants here and it seems that you consider that an operative dynamic in these circumstances. Based just on what you have posted here, you are probably not right about that, at least not within the framework of discrimination laws. The decisions of your manager and employer are not wrong or even suspect because of common race with the employee you do not get along with. Simply put, if we assume that your co-worker is worthless on the job and not meeting her employee obligations, that set of facts does not give you any legal options or rights. If we assume all that and further assume that your employer knows it, that set of facts, too, does not give you any legal power or options.
If what you have posted here is the universe of relevant circumstances, your choice is to find another job or find a way to get along with her -- or find a way to cope with the chronic discord. Under the law, what you have described is not a hostile work environment or actionable discrimination.
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Normally I would tell you to go to HR to report the matter, but your situation is complicated given that you are already in HR. You have no ability to control whether the employee is going to be a hard worker or cut out coupons if the boss does not care about this. On the other hand, gaining access to your personal information and sending that to her personal email account is a violation of your privacy rights depending on what information was accessed. This is something that you have a right to take action on, but again it depends on what the personal information was. You should meet with an attorney in your area so he/she can explore your case more fully to see what you can do to at least protect yourself from any complaints that may get directed towards you. You may be able to force this issue with your boss, or go over the boss' head as to the taking of personal information, but you need to be very very careful about this. This is why seeing an attorney would be best before you do anything
I would take a look at your employee handbook and go over your manager's head using the appropriate channels. There really is no legal claim here (or damages). There could be in the future, i.e. retaliation. Also keep in mind that "reverse" race discrimination is an actionable claim under federal law.
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