I want to replace a switch (not 3 way) with a switch that also has a plug on it. Does it wire the same? If you could check out my other question
Your new switch/receptacle combination will need 3 wires. The old power and switch leg, (lead to the light), will need to be connected as well as a neutral, (white), which will need to be connected to other neutrals in the box. I noticed from a previous question, that one of your whites was a switch-leg. Some switch boxes don't have a neutral wire. If this is your case, don't do it.
Like Irv stated, you can do it if you have the correct wires in the box. You need a hot and neutral and ground to feed the receptacle part. You need the hot and the wire going to the light or whatever, on the switch. Your wife is correct and you should get an electrician to do it for you.
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From your question It is clear to me you need to hire an Electrician to do this job for you. Hey these guys have got to earn a living too! Consider the safety factor for you and your Family. A good Electrician is worth his weight in Gold!!