@DrewDad,
I have personally been a victim of MBI, wherein a woman I was involved with "had a house fall on her, killing her friend and breaking her sternum, ribs, and several vertebrae", which postponed our meeting. 2 months later, we met and she was in physically impeccable condition, and seemed like a normal, and very sweet person. Upon her return home, she informed me she was scheduled for chemo. We maintained regular contact throughout her "heartrending" battle with liver cancer, chemo, and several liver surgery, and met again 2 months later, and again, she was in physically impeccable condition, including her long hair and lack of scars. She left for home telling me she had 2 months to live. We maintained regular contact for the next 5 months as her "cancer" spread into her pancreas, she was in and out of "diabetic comas", had stomach surgery for cists. Several of her planned visits to me were cancelled due to various emergencies, including a visit to S.Dakota to meet with the bank (where her "$43 million" was invested). Her "relapses" usually coincided with my requests to visit her, followed by miraculous recoveries. Eventually, other members of the internet community set me wise, and I started adding up the facts and cross-checking things. Each individual story, taken on its own was quite plausible, but when viewed as a whole form a picture of a very disturbed pathalogical liar. This had a very polarizing effect on the internet community in which we were involved, as sympathizers were shocked at my callousness.
There are several things to look for: One is a series of dramatic emergencies and miraculous recoveries. Another is that the person will often have multiple careers or degrees. A third is communication from their "friends" often have the same writing, grammar, syntax, and spelling patterns as the person themselves.
I no longer maintain contact with this person. I still feel quite sorry for her....not because of her cancer, but because she is obviously a sad, lonely, and mentally ill person.