Nothing in your description here raises any issues of "hostile workplace" as that term is defined in the law. Further, nothing that you have described here supports any legal claim or action against the employer. If your employer instructs your attendance at meetings, you need to go to the meetings.
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Ms. McCall is correct. You are not describing a hostile workplace in the legal sense, and your employer has the right to require you to attend this meeting. Go, and be as polite and reasonable as you can while you are there. The more "complaints' you lodge about the meeting and the angrier and more upset you are about it, the more you will tend to substantiate your employer's suspicion that whoever called 911 had good reason to feel threatened, which will not help you at all. Bite your tongue and do the best you can.
There is no law that requires you to be interviewed or considered for any particular job. It sounds as if the other county could have handled the situation more gracefully, given that you were an internal applicant. They didn't. It's annoying, yes, but you need to figure out a way to let it go.
It sounds as if this workplace is not a good fit for you. Perhaps you should look elsewhere. Good luck.