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You are correct.  I think she's delusional.  Her whole calculation is she tried to create this maverick personal, because she had presidential aspiration.  Turns out people fucking hate her.  Everyone.  Despite the fact that she is delusional, I think somehow she will be convinced not to run.
The "dilemma" he's referring to is the notion that Democrats might be better off not running a candidate and supporting "Independent" Sinema as the best chance of holding onto the seat.
This makes sense if you live in Washington. If you populate the real world, Sinema has a 0% chance of reelection whether the Democrats run a candidate or not. She's so incredibly unpopular, she cannot win, even heads-up against whatever fucking lunatic the Arizona GOP selects.
The only real question is whether Sinema will run as an independent and spoil the election for the Dems.