Make a copy of the file before you try anything else. When trying to recover the file you might make destroy it.
this is the best advice. copy and save.
I usually try opening the copied file since I don’t care about.
Now right click on it and try to open in a web browser.
That usually works and then I save the file
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Don’t know why but when I use other programs it is not looking some thing as a requirement to continue.
Kind of like opening a password protected Word file and using open source or wordperfect.
BTW, did she pass protect and forget the password?