uncontrollable laughter is a symptom of a sub-type of schizophrenia... let me look it up for you. I know what you mean - I saw such girls in psych hospitals.

Being pregnant with Christ is also schizophrenia, most likely (again, I surely saw people like that on the psych unit).

Since she walks around telling others that she is pregnant with Jesus Christ, she will have her reputation damaged forever pretty soon. That is very sad - it is a very difficult situation, because she is not in a good position to listen to the voice of reason coming from you. What country are you in?