She is ostracized by the Governor of her state, who happens to be in her same political party, and a guy who has his sights firmly on higher office. She is obviously on the outs with the County Executive. And she has earned the reputation of being difficult to deal with. For a politician, that's a formula for failure.
And for the record, I have my reservations about putting a stadium in Kennedy Square. I am opposed to State funding for private development projects like a stadium. And I am neither Democrat nor Republican. I just think Miner is a poor representative of a City which has a slew of problems and is in need of a change of direction. IMHO, she is not a leader. She is not a innovator. She is a functionary and a critic. I believe she had the opportunity to turn that situation into a win, but her own petty pride, as well as her other shortcomings, kept her from seeing an opportunity. Instead, the only reaction she could muster was a roadblock.