It appears your wife is cap exempt so a new H-1B petition can be filed right away.
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Your wife is not subject to the visa cap, assuming that her first employer was not exempt from the visa cap.
Her employer can file an H1B petition for her requesting change of status from H4 to H1B and request immediate start date if desired.
She is CAP exempt.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.