Hey Siricosirus

Thanks for reaching out!

Based on the screenshot you included it would appear that this network issue your GF has been experiencing is likely originating at the ISP. You can come to this conclusion because the trace to your router shows no packet loss while all 3 of your traces to external targets exhibit packet loss.

You can find more information about interpreting PingPlotter results in the following articles:

Interpreting Latency and Packet Loss
Interpreting PingPingPlotter Results
Common Network Problems

With that said once you have collected more evidence of this issue if it continues to appear to be an ISP-related issue I suggest checking out the following article:

Building A Case

Best of luck!
-TJ