You can sue her for the amounts that she is responsible for that you had to pay. You may want to confer with an attorney to determine if you can...

Yes if they did not respond in a reasonable time you can withdraw the offer. ◉

Note, You must respond in the legal way and on time with, for example a motion or an answer with affirmative defenses. Failure to do so could...

If they properly settled the debt they should have the written proof. ◉

Interest rates are set by law for judgments, or in the judgment itself.

Yes you can. Make sure any agreement is in writing and is fair.

It might take longer, these often do. If it is not provided ask your attorney, I writing, when you will receive the funds.

The insurance company has a right to make their determinations.

It may be a case. Medical malpractice means that a doctor violated the standard of care. A bad outcome is not enough. Another chiropractor would...

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Such a case would be difficult but possible. Consult with experienced attorneys in the state where this occurred.