She is needing less than a full bag of 16 oz melts so the corn syrup would be less than 1/3 cup....
And it also depends on the type of chocolate you use... Here are my recipes: (I always use 7 oz. of chocolate)
Bittersweet (dark) chocolate
1/4 cup corn syrup
Semi-sweet chocolate
3 1/2 - 4 tablespoons corn syrup
White chocolate
1 1/2 - 2 tablespoons corn syrup
Milk chocolate
2 1/2 - 3 tablespoons light corn syrup
And it also depends on the type of chocolate you use... Here are my recipes: (I always use 7 oz. of chocolate)
Bittersweet (dark) chocolate
1/4 cup corn syrup
Semi-sweet chocolate
3 1/2 - 4 tablespoons corn syrup
White chocolate
1 1/2 - 2 tablespoons corn syrup
Milk chocolate
2 1/2 - 3 tablespoons light corn syrup
Are you pleased with the results?! 
1/3 cup = 5 tablespoons + 1 teaspoon fluid ounces
We'll use 5 tablespoons as the measurement.
So if we use 5 tablespoons for 16 oz candy melts that equals 0.3125 tablespoon of corn syrup per each oz of candy melts (5 divided by 16)
For every ounce of candy melts, you need one third of a tablespoon of syrup.
10 oz of candy melts (that you're going to use) multiplied by 0.3125 tablespoon = 3.125 tablespoons
So use 3 TABLESPOONS of corn syrup for 10 OZ CANDYMELTS, plus a tiny bit more.
All these calculations done on the OP's original recipe of 16 oz and 1/3 cup of corn syrup.
YES infinitsky!! It is great! It is JUST LIKE clay... I have only made figures with it or covered RKT with it but it works great for me... I put it in the fridge to store it and it does get really hard but you just slice off a piece and work in some corn syrup and it's good as new!
Thank you, I will make the dark chocolate and I will see how it goes!
Be careful when you make candy clay. It is delicious! 
I think I ate more than I put on the cake.
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