On Thursday, 2 March 2017 20:12:40 UTC, DerbyBorn wrote:
Daughter is trying to use WiFi instead of a wire travelling up the stairs.
What should she consider - and Extender that appears to boost the signal

Extenders / boosters / repeaters boost the signal level, but because they share the same frequency band as the 'hub thing' they halve the speed.

Instead of a wire up the stairs, what about external ethernet cable out through a window frame downstairs and back in upstairs? Or up to the roof, into the loft, and an access point on the landing ceiling?