Actually there are wireless printers for laptops. They either need home WIFI wireless equipment for home networks, and that is not feaseable for on the road work.
However, if the small printer is close to the computer at all times, it would be just as simple to attach a short USB cable from the printer to the computer.
You also have the option of using BlueTooth for wireless communication, if the small printer and the computer both support that format.
I assume that when your daughter is doing her printing of her documents, she is not connected to the Internet? And I also assume that she is not doing her printing while driving on the road?