Oh my, skyepayne! What a difficult position you're in. Your post seem to indicate that it comes down to her word against yours. This patient is definitely instigating in the worse way. Does she feel that you are not concerned about her well-being? If you are in fear of your license, maybe you should consider getting legal advice if management is not being proactive.
I would like to offer my two cents, as usual. Your post seem to indicate that this person has some problems that may go deeper than you. Is she a candidate for a psych eval? I do know, as many others, that chronic, uncontrolled pain can have an adverse effect on the psyche. Have you attended any team conferences that included this patient and/or her family or an ombudsman? Perhaps she needs a revision of her care plan that would specialize her care? Do you fill out incident reports to give to management (making a copy for yourself) since you feel your license is threatened? Even though it may be short-staffed on the unit you work, do YOU have to provide care for this person? Can management get another nurse to provide care for this person? As I indicated earlier, your employer is not being very proactive in protecting you or themselves in this matter.
Finally, do not let this situation break your spirit. Let this problem make you a stronger person. Keep your head high and make sure you come to work with the best possible attitude and in a positive frame of mind. Best wishes.