USC sponsor must attach a copy if her federal tax returns, with all schedules, irregardless of whether she filed her taxes jointly or not. Since YOUR income was legally earned (and apparently reported) it can and will be taken into account as well. If you two lived under the same roof together for at least 6 months, you the beneficiary will need to complete and sign Supplement A to Form I-864 "contract between sponsor and household member".
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Review the exact filing instructions carefully, if still uncertain or confused, retain a licensed immigration attorney to complete the process for your family.
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I join in Mr. Behar's answer. Good and comprehensive explanation.
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Your income can be considered. In addition with tax returns submit paystubs for your wife's current job along with employment verification letter. If her current income is above the threshold, you should be ok. Consider hiring an immigration lawyer to handle the case for you.