Evidently; she was upset about it too. Probably just as much as Kaito, but it didn’t stop her from worrying about her cousin. Regardless of their relationship.
”N-no… I haven’t seen him for a few days. I just — I thought you would know.”

“Today, Kaito wasn’t –”
Kaito wasn’t in the secret place, but he remembers he can’t say it in time.
"– I’m going to look for him.“