Last time Sekhmet told Isis that she needed her (Sekhmet's) help because Isis' own nightmares weren't going to leave her alone until Isis figured out what the nightmares were trying to tell her. Isis then figured out the nightmares were her own guilt for Seth's suffering, so I guess this means for Isis to stop wasting time with daydreams about the happiness she lost, and get her azz in action
I've finally found the actual chapter: it was in chapter 127. Sekhmet told Isis they should make a bet about whether Isis would or would not change her mind once she, Sekhmet, showed her something. So now we know that record wasn't part of Isis' memories, Sekhmet was the one deliberately showing it to her.
What was the bet again?