Friendliest.app says
The Boysen Apple Freeze is an apple juice slush with berry syrup and passion fruit/mango foam topping.

It is free of gluten/wheat, milk, fish, shellfish, peanuts, tree nuts and eggs.

The foam topping may contain soy.

It may be possible to make this treat soy-friendly by ordering it without the topping.

The Minute Maid Apple Juice Slush is purported to be Minute Maid 100% Apple Juice Concentrate.

The berry syrup is purported to be Wildberry Syrup, produced by Monin.

The passion fruit mango foam is purported to be produced by Fomz, a Sun Orchard brand.

Note: Maurice's Treats is a small cart that serves several treats containing gluten. If you are highly sensitive to gluten or have celiac disease you will want to assess if items are being stored and handled in a way that limits cross contamination.