Frank says it well. I think we all agree that it was rather inappropriate to show them to your coworkers but since this cannot be undone, at least you drew a lesson from it which may help to better your relationship with her. It's not easy having to deal with a sister like that and I give you credit for having done so for so long. My mother can behave very embarrassingly (not nudes but tantrums in public at age 45 etc.) and I can sort of understand the revulsion and distaste which can be very confusing/hurting since it's felt towards someone we are supposed to love. The best measure perhaps is to try to see things from her POV and offer some support, or else we can keep our distance and respect her privacy/boundaries but not cause more distress (for both parties) through further contact.

Have you considered seeking her help for addiction? It is possible that she may be suffering from other MH conditions and sometimes it takes a 3rd party to get us the help we need because we simply don't see the issues ourselves.