Responses
It's not like she's literally upset in this part, she just blurted it out, out of strangeness she feels, she's being tsundere here (=・ω・=)
She also probably forgot about it cuz its been 4 years and in all those 4 years she's been trying to forget everything. :V
BLAIRE...remember when u told the maid to tell Chloe u ran away...y r u upset Claude thinks u ran away????