Generally speaking, your husband's step mom now has an ownership interest in the property. Therefore, the simplest step is to have her execute a quitclaim deed in favor of you and your husband. An Arizona attorney can definitely assist you with this, and the cost should be small.
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Mr. Nagel is certainly correct and a quit claim deed works so long as your husband's step mother is willing to sign the deed. If she is not willing to sign the deed, then a whole new set of issues comes up.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. I am licensed in Arizona and can only provide general comments on matters outside of Arizona law. Actual legal advice can only be provided after a direct consultation in which all of the relevant facts are considered before providing a response.