she is saying to reply with a line used by a non playable character (NPC) in a role playing game (RPG). The lines most NPCs use are usually repeated over and over every time you walk by them since they are usually just programmed with 1 or 2 different lines to save time, and they are programmed to say them as you go by. One of the more famous instances of this is from Skyrim, just about every soldier you go by would say "I used to be an adventurer like you...then I took an arrow to the knee"
I hear it's amazing when the famous purple stuffed worm in flap-jaw space with the tuning fork does a raw blink on Hara-Kiri Rock. I need scissors! 61!
"Let me guess, someone stoll your sweetroll?"