She knew Ishtar was strong, mostly from Avoca prattling on about it incessantly, but she had no idea how strong. Her Saiyan blood was boiling with the need to find out how strong compared to herself, but the time wasn't right. She needed to stay focused on the task to come.
After, though, there was no such threat, thus nothing to distract her from her… research.
"We'll find out soon, but not today. Perhaps a litmus test tomorrow, then I'll put your power to the test myself at a later time."