By "Pampered Chef party," do you mean a typical sales party? Where this other lady will be making money at your friend's shower? If you do, I think that other lady must be the tackiest person alive in this country to suggest such a thing. Do you feel comfortable telling her that a sales party isn't appropriate? I dunno, maybe it's no big deal in your circle, but I'd about die if my shower or if I went to a shower that was a sales party.
I do think a cooking theme is a great idea. Would you want to make it specifically a stock-the-kitchen shower, where all the guests bring kitchen gifts? There are lots of great invitations available.
Mimosas are kind of brunchy; a mix of white and red wine would be good.
I would change the time or make it perfectly clear that you're not serving dinner. 6pm is dinnertime, so move it earlier or later if you can; if you can't, make sure to put on the invitation that apps and drinks will be served so that people don't bring an appetite.
Where is this going to be held? Will you have access to a kitchen? I just had to throw a party OOT and pulled it off really well with dressed-up store-bought deli trays. You could do cheese and crackers, veggies and dip, artichoke dip, a cookie tray.
The wooden spoon is a cute favor gift. Will the recipe card have the bride's favorite recipe on it?