Old school supervisor / leaving job

I have an old school boss that doesn't support me leaving the job. She wants to keep me there since I'm good at the job. I am concerned that she will make me look bad if prospective employers call to verify my employment.

How should I approach this situation? Should I hope employers won't call to verify employment? Should I have an open discussion with my supervisor to let her know my situation, and that I wouldn't leave her high and dry? I'd be able to offer training to the new hire as needed. I don't think I'd get fired on the spot.

I'm pretty frustrated about this situation. I'm open to your suggestions/perspective.

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