You need to find what printer model it is, search for its drivers and install the drivers on that laptop.
steps:
Using her laptop:
1. Find out printer model from printer (look at sides, front, bottom etc)
2. Google that model. See if you can go to the drivers page. Look for drivers install. BEWARE. Only install software from the actual company website (hp.com, samsung etc) Other website can install bad software on the computer.
Best to get tech help from someone who can do this for you.