Measure out the chilled white wine and fruit juice, and pour them into the blender.
Add the ice cubes to the blender, ensuring they are evenly distributed on top of the liquids.
Pour in the simple syrup, which helps balance the tartness and adds sweetness.
Secure the lid on the blender and blend on high speed until the mixture is smooth and slushy, about 30-45 seconds.
Check the consistency; if it's too thick, add a splash of juice or wine and blend briefly to loosen it.
Pour the chilled wine slushie into glasses or cups, using a spoon if necessary to help transfer the thick mixture.
Serve immediately with a straw or a garnish of fresh fruit for an extra colorful touch.