Then she needs to check if the problem is her internet connection is OK or not. If she has an ethernet cable cable, then try connecting the laptop DIRECTLY to the router with the cable. If it still doesn't work, prove that the laptop is working by trying it with a friend of neighbours router, with WiFi and cable.
The problem is quite normally the router itself. If she had no problems unup until now, try switching the router of and then on again. Sometimes they get themselves into a tizz ( yes, correct technical word ! )