|If it's internet explorer, she can hold down the control button, and use the mouse scroll key to scroll it up and down.|
Changing resolution to a smaller resolution would make everything look better, but that's because it "zooms" in. You'll notice you have less desktop space. To adjust the text size, you can:
right-click the desktop, and select Properties. Then click on Settings, then click on Advanced. Now click on General, and choose a different DPI setting. You can even choose custom, and adjust the text to the way you like it.