I thought I'll just update this thread - My mother decided she will wait until June before upgrading her laptop to Windows 10. It was originally supplied with Windows 7 Professional.
Earlier today after using the laptop, it was accidentally left running. What happens if you leave a laptop running idle without the power cord connected? It normally goes to sleep after 15 or so minutes, ... but not this time! After having lunch, up on the screen was "Welcome to Windows 10". In the hour we were away, it had carried out the upgrade and no one else was near the laptop.
What's interesting is that any time I upgraded a computer to Windows 10, I had to accept the licence agreement as well as several other steps. So it's interesting here that when it did it on its own, it skipped all the steps.
Obviously my mother was very surprised seeing this happen. She said any time it popped up a nag screen for Windows 10, she just clicked the 'X' to close it off.