This is a fantastic resource. Thank you. A new quiet small fast PC is the preferred option (her current machine is a bit slow), but replacing the fan with a quiet fan is very much worth looking into. Thank you.
While you're at it, check how much RAM it has. Some older, but not too much older, machines end up RAM constrained and can perform significantly better if RAM is maxed out (if prices for the older RAM have not become excessive).
If you're opening the machine anyway to swap the fan, might be a good opportunity to upgrade RAM.
Beware of spending more on the machine than is worthwhile, though.
