Does anyone know what colors to mix to achieve MAUVE color?

I believe Americolor makes a Mauve color gel.

Wilton makes several mauve tones - http://www.wilton.com/store/site/product.cfm?id=3E30B2D9-475A-BAC0-5D5C3DB846DFD354&fid=3E33265A-475A-BAC0-597A6ED538D55E2B

If you don't have access to get the gels and you need it right now... Start with pink, either with the pink color or by mixing red and white. Add a TOUCH of purple, like the tip of a toothpick worth, a little at a time until you get the shad you want.