So, I finally reached out to the store to tell them of my concern, and they took her to the vet for me. Turns out she's completely fine. They did all the stardard tests, and this is the same vet I use. This guy is amazing. He basically said that the sound she's making is just her unique little parrotlet sounds. Amusingly, no one at the store realized that either. She was apparently making a sound none of us had heard except the vet.
She's now back home with a clean bill of health from the same vet I wound have taken her to for her first check up. She's very happy to be home with scritches from her mama, fresh veggies, yummy fruits, hemp seed, and Pascal...but mostly the hemp seed.