I think it’s a scam she is playing to get out of the debates. She knows as well as everybody else Trump will absolutely obliterate her in the debates, expose her like an atomic bomb. She’s a fraud and she knows it, and without the ability to hide and duck while the media pushes her myth, she knows she is toast. So I think she is playing a game here, she is going to play sick all the way till the election, probably have herself hospitalized and take the chance she can win without debating. Remember, Trump isn’t running against a politican, he is running against a criminal con-artist who is defended and protected by other crooks. This is going to be one huge joke, and after the election if she wins *poof* WOW what a surprise she will be all healed!
Conjecture for sure ... but well within the realm of possibility.
Two obstacles to your theory: Ego, and a bad bet.
Her ego is too large for her to think she would be defeated.
And it is too big a gamble to portray illness prior to an election, for whatever reason.