Hello pulchritudinousv: Welcome to PsychCentral! PC is a great place to gain support as well as to get information related to mental health concerns. There are many knowledgeable & caring members here.

I have to say I'm not qualified to comment with regard to the symptoms you're describing. Mental health diagnosis is best left to the professionals. Anything I, or any other non-mental-health-professional, would say with regard to this would be pure speculation. Clearly, however, your sister is struggling.

Whatever the technical "label" would be for her condition, the reality is that she is losing touch with reality. She needs professional attention. Ultimately, however, she is an adult & she's responsible for herself. In most cases, unless a person is a danger to themselves or others, they cannot be forced to seek treatment. So, with that thought in mind, what diagnosis a mental health professional might give her is really beside the point if she won't seek help. What you can do is simply to keep doing what it sounds like you've been doing... keep encouraging her to seek mental health care. I wish you success with your efforts to help your sister in her time of need...