There are always stories of people installing Linux on their parents computer to provide them a more secure and stable operating system, seems interesting to share experiences.
Edit: I’m assuming that parents are okay with the changes, or do not care. Obviously do not force anyone to switch OS if they don’t want to.
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WHAT!? Apparently desktop icons are forcibly rearranged and while the location of the setting varies across versions, you can turn off the auto-align to let her do that. I haven’t used a Linux UI for a few years but this may help: https://forums.linuxmint.com/viewtopic.php?t=288291.
I hope that helps make her happy:-).
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I may prefer Mac OSX, but Linux really is a fantastically beautiful - and functional - OS, so I am glad that she can enjoy it better with this!:-)