The T-Rex hadn't noticed Pidge, no. But that shouting? Oh, yeah. She's jogging towards Okuyasu's direction, roaring in anger that he's so close to her nest.

But then she's distracted again by Kuja. She roars loud enough to make his bones rattle, chasing after the damn fly.

If the goal was to piss her off, congratulations! She snaps for Kuja but knows she'll likely miss. Keeping an eye on him, she still heads for Okuyasu.