Maybe she should be a lot more worried than she is, given what Strange is implying here, but his insistence on making this a thing has her digging her heels in even hard to prove that there's not actually anything wrong with her.

"It's been several days since we fought the Mother, and you are hardly the first person that I've talked to since then. Don't you think that if I was having issues with my memory, someone would have noticed by now?" Peridot snaps. Her eyelids are starting to droop; getting riled is making her feel more tired, like she's trying to draw on a source that's tapped out, but that isn't stopping her from continuing on.

"I killed a high faerie. I did a good job! Now if we could talk about something else, that would be nice, because I don't exactly have an excess of energy that I can waste on arguing with you right now!"