Wlan works on 1 laptop, but not anymore on another laptop

As the title says. I have a WLAN with my computer and my sisters computer. Until a few weeks ago it stopped working on her computer. I broadcast the SSID. It has WPA-PSK encryption, but on her computer the network doesn't show. And trying to connect anyways by filling in the advanced options doesn't help. Sometimes by wiring her laptop she can get online, but also that is not working properly... Any suggestions is very much appreciated?

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