She should have, finished her term, as a Republican.

She should then, run for office, as a Democrat.

Her sense of shifting loyalty, should have waited.

Now, she has betrayed her political party.

She had the Republican political endorsement, she had their campaign money, she had their political manpower, she had their political knowledge, etc...

She was a political unknown, when she started, with a 50-50 chance to succeed.