WWDD: S1E8 “I, ROBOT… YOU, JANE”

While Buffy helps Mr. Giles at the library, Dawn flips through the Dawnmeister Chronicles, reflecting on everything that’s happened in Sunnydale: the mysterious deaths no one acknowledges, her mom’s BBQ fork “accident," the boy Buffy was kissing (gross!) in her room with the fangs. The next morning when Willow shows up late for 5th period, Dawn sits in computer class working on her Mavis Beacon assignment. The class is suddenly distracted by what the teacher sees on Kirstie's screen, gasping in horror and characterizing it as “the most offensive, foulest, abhorrent content she’s ever seen,” while Kirstie vehemently insists that she didn’t write it! The strange, but timely, distraction allows Dawn to get on the net. Typing “vampire” into the Alta Vista search bar leads her to a website, “Demons, Demons, Demons,” before the chaos dies down and she’s forced to abort.

Buffy comes home that night and tells Dawn about Willow’s new online boyfriend. Buffy is unhappy about it, which is clearly just because she's jealous of how cool Willow is. She tries to bring up the other night with her fanged boyfriend, but Buffy insists that all Dawn saw was a shadow.
The next day, Dawn can’t log into her school computer. She learns that her entire school file and many of her digital records—including her birth records—have been deleted, as though she never existed. Dawn panics, believing her extracurricular search resulted in a computer virus, and shuts her net investigation down.

Buffy is out late, again(!), and her room is empty, so Dawn sneaks into Buffy’s room to find her sister’s diary, looking for answers. She opens Buffy’s nightstand but it’s not there. She must have moved it since that night. The sound of Buffy climbing into her second-floor bedroom window startles Dawn back to her room. She quickly climbs into bed, looking sound asleep when Buffy checks on her, already making plans for the next time Buffy sneaks out.