Boundaries aren't any good if she doesn't also have things to do to manage her stress. I haven't read any of your other posts, other than this thread... is your wife getting any sort of treatment or therapy? What resources do you have at hand?
Speaking as a supporter of a person who has not sought any treatment, and who can lash out at me under some circumstances, but who does try (at least sometimes) to manage his stress, it's very, very hard to cope long term with a person who is abusive when they are triggered. There's growing documentation that the supporter of someone with active, unmanaged PTSD can also develop PTSD symptoms. It happened to me. So the long term danger is that you might become less able to cope, and less able to be a carer.