Demi really wasn't judging her one way or the other. She just didn't want to hurt her in any way, or let the compulsion from her music affect her. She used her abilities when she needed to, to help people, but she didn't want to start using them in her daily life. That seemed very wrong. That was why she'd picked a place where that was unlikely to happen, and why she was slightly disturbed that the place didn't seem as abandoned as she'd hoped.
"I'm pretty new, yeah. I've been here about a month. Guess we're just missing each other."
She wasn't going to suggest that she'd never seen Ella out here so she must not be telling the truth. She wasn't here 24/7. It was completely likely that they'd simply never been here at the same time.