She knows that she will lose the primary to a real democrat next time around, so she is trying to strongarm the democrats into not fielding a candidate. Of course that won't work, because the national democratic party won't put up with it, and even if they did, there would be people who would run for that juicy spot on the ticket. So if she runs in 2024, she will split the vote and put a republican in her old seat.
Big pharma wins either way, because that is who she represents. That is also what the democrats need to say in every campaign ad against her. A vote for sinema is a vote for high priced pills.