I'm not sure about the mix that you mention, but I have added just a bit of cream cheese into my regular buttercream recipe for the taste of the cream cheese but the decorator quality of my buttercream.
we used a mixture of half buttercream/half cream cheese icing where I worked. It was the most popular icing for wedding cakes... and was called "cream cheese mix". lol
Was "cheesy" in reference to the cream cheese or the design 
Recipies are basically 2 cups fat. So 2 cups Crisco, or 1 cup crisco 1 cup butter, or some mixture thereof... so replace 1/2 cup of whatever with half a package of cream cheese. It is super yummy.
She just doesn't want the icing to taste too cheesy, but is adamant that she wants only cream cheese icing!?! 
The crusting cream cheese icing from this site is good and not too "cheesy".
I'd mix the two together. She doesn't know what recipe you're using anyway. If she asks, just tell her it's a secret! lo
l
I really like the crusting cream cheese recipe on this site. I didn't find it to be too cheesey at all. Maybe make it and then mix some with half buttercream and let her taste them both.
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