@Ragman,
Quote:...We're hoping that a neurologist appointment will shed some light on this recent abrupt change....
I'm a nurse Ragman. I have some experience with similar situations (over 3 years in a neuro ICU). Obviously a neurological assessment is in order, as you are getting. In terms of how you as a loved one and you as a family can help...
Reorientation to reality is necessary. This must be handled delicately, however. Imagine how terrifying it is to be unaware (at least completely) of your own actions. When your sister does something that seems out of character, gently help her to reflect back on the situation so that she can construct an explanation for the behavior (our minds do this anyway). The "I can't believe I did that" is a very easy rationalization, and it is easy and necessary if the explanation must protect personal identity and pride.
As Frank has jokingly pointed out, a huge step in dealing with memory loss is accepting that it is there. There are cognitive exercises that can help your sister (her neurologist will be able to elaborate on these).
I commend you on your concern and prompt action on her behalf. Her family is going to be very instrumental in developing the skill to deal effectively with life moving forward. I hope you communicate to her neurologist your willingness to learn about the ways in which you can help.