Did she do Wi-Fi Clone? If no, then the default wifi network name of the powerline extender is something like TP-LINK_xxxx, not the same name as the router. So she can check if there is a TP-LINK...

You don't have to buy the same model, all the powerline units in TP-Link can work together. You can purchase a single unit(not a kit), like TL-PA4010 or TL-PA411.

If all the lights are off even the power light, then I think no other ways to try.

SashaRIS wrote Hi! I have problem with Guest Network: can be connected. What can i do? Hi, When you are in the time of the Select Days, are you able to connect to the Guest Network? You can try a...

Hi, the router doesn't support Hostname.

Hi, It's suggested to initiate a ticket to TP-Link Support, ask for a beta to have a try. http://www.tp-link.com/us/support/contact-technical-support#E-mail-Support