Windows 7 is quite similar to Vista, so a PC with that OS should be fine for your Mum.
This one form ebuyer should be suitable. It has decent reviews too:
This Dell at Argos also has Windows 7:
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?