Dualbooting is great. Whole idea of linux is “you can tinker in any way you see fit” and putting multiple OS on a single computer is one example.

Fact that you did this at 15 is impressive btw. Willing to mess around with computers is a real skill. Half the CS students in my college had hard time setting up a fedora VM by themselves for UNIX class.

You are already ahead of actual college students in this field lol. You learnt more about computers thanks to old GPU.

There is nothing wrong if someone doesn’t want to switch to a new OS. That being said, isn’t her buying a new computer better? Old one becomes unused then.

Putting lightweight linux on an unused old computer and seeing it become better is like the standard procedure. You could even make a custom rice for her.

Redhat have very cool licensing.

They basically charge for commercial use but keep it free to personal users.

Redhat stock value reached at $190. (For perspective apple’s current stock is $200)
IBM bought redhat for $34 billion in 2019.