|It would help us help you if you'd tell us what application she wrote the document in. |
Assuming it's MS Word, I would try 2 things:
1 - Right click the file, choose Open with, and try WordPad.
1.1 - Also try NotePad
2 - Take the flash drive to another machine with Word (or whatever app it was written in) and see if it will open correctly on that computer.
If it still shows boxes on another system, then the document is probably corrupt and she might be out of luck.