Add the Water, Elderberry liquor, vodka, and strawberries to a blender and purée until smooth.
Pour into a large pitcher with the bottle of wine. Fill the slushi machine to the max line with this mixture (you may have extra to top off the machine once you start serving). Press the Spiked Slush Setting on Ninja Slushi, and adjust to your desired frozen level.
Once the mixture has adjusted to your desired frozen level, serve and enjoy!