If there's any reaction from her, it doesn't carry over through the scroll and she answers as if the pause in the conversation was of little concern to her.

"My sister, Ruby Rose. She works at Bon Bon's shop. We were both trapped in the Dreamscape along with a mutual friend, but she hasn't returned."

So she can only assume Ruby's still trapped there because the next most likely scenario is going to make her livid. More so than she is now.