" Could also mean hyperthyroid with the white of the eye (sclera) visible all around."
Had a great aunt that was hyperthyroid, painfully thin, too hyper. Then she got crazy as a loon for awhile until they removed part of her thyroid. This could explain the whole thing.
Jennifer could be bipolar. This would explain the extravagant wedding, her gaunt face and her bizarre behavior. Unmedicated or stopped taking her meds? Interesting to see how this plays out.