or she's just delusional, smart people can be delusional

Delusional to what degree? Because fraud and manipulation typically require intent. If she has lost touch with reality to the degree that she believes her lies, she needs psychiatric help and I haven't seen a single person offer that defense including her legal team or the two successive men that served the joint role of her business and romantic partner. If she's that detached from reality, wouldn't it be more likely that she's the one being manipulated by the non-delusional folks around her? How could she be the ringleader of this fraud and manipulation if she's the delusional one and everyone else is sane? Those are some of the questions the movie explores.