Can I make caramel sauce with crystalline fructose? I'd like to make a caramel sauce with crystalline fructose as my mom's diabetic and can't have sugar. 

I know (in theory) that fructose caramelizes at a lower temp than regular sugar, but I'm not sure if caramelizing crystalline fructose would lead to a similar taste and if I should do it the same way as if I were using sugar. 

Thank you v much :)
It won't caramelize, it doesn't have the same properties as sugar.

What you can do is brown butter, cook it with cream, and flavor it with vanilla and crystalline fructose to approximate caramel. I haven't tried this, there are a variety of "diabetic caramel sauce" recipes you can google.