[George Foster]

I talked to my dad about this, he said that this is no different than that coach that accepted the job at Arkansas and then quit the next day.

He said anybody can send an e-mail, that does not mean they have a legal leg to stand on. Your wife had a change of heart, period. "at-will" protects both the employee and the employer. I would send and e-mail and say, "I resign." You can quit at any time, just like they can fire you at any time.