Yes but she won’t have home WIFI at all so there will be no network for her devices to use to talk to each other. She is going to be using public WiFi’s. They rarely provide printers matched to the same network.
My laser printer is a HP (non-wireless) that I have hooked up to my AirPort Extreme. I can print to it from my iPhone two different ways, one if I am on my wifi and one if not.
On my wifi I just select print the document and select my printer - printing done.
This works whether my AirPort Extreme is connected to the internet through an ISP or not.
The AirPort Express may work the same way, and for the price would be worth it just for the printing capability - if it indeed does work like the Extreme. Certainly less $$ than a new wireless printer.[/QUOTE