Encountered: Chapter Two - in the streets of Huntsdale, Chapter Three - in the streets of Huntsdale (with Seth), Chapter Six - in the streets of Huntsdale.

After first meeting Keenan (and he, unbeknownst to her, sealing her fate with the words of the Game), Aislinn is panicked enough to start running - never a good idea, as fey always love to give chase. Some of her chasers include wolf fey:

'And she was panicked, more than she'd been in years, enough that she'd actually run for a block, attracting faery followers. Several gave chase at first, until one of the lupine faeries snarled at the others and they'd dropped off - all but one female. She loped alongside Aislinn on all fours as they ran up Third Avenue. The wolf-girl's crystalline fur chimed with an eerily appealing melody, as if it would lull the listener to trust. Aislinn slowed, hoping to discourage her, wanting to stop that chiming song. It didn't work.
[...]
As she rounded the corner on to Crofter, the red neon sign for the Crow's reflected on the faery's fur, emphasising holly-red eyes.
[...]
Then one of Seth's friends, Glenn, stepped in her path. He had so many bars in his face, she'd need to touch them to count them all.
Behind her, the wolf-girl paced, circling closr until the pungent scent of her fur was chokingly heady.
"Tell Seth his speakers came in," Glenn started.
The wolf-girl, still on all fours, nudged Aislinn with her head.
Aislinn stumbled, clutching Glenn's arm for balance.
[...]
She couldn't tell him the truth: the scary things weren't the guys smoking in the alley, but the lupine fey growling at her feet.
[...]
Glenn watched until she turned back to the street.
The wolf-girl snapped at the air behind Aislinn's ankles until she gave in to her fear and took off jogging the rest of the way to the railroad yard.
At the edge of Seth's lot, Aislinn stopped to compose herself. Seth was pretty together, but he still freaked sometimes when she was upset.
The wolf-girl howled as Aislinn walked the last couple of metres up to the train, but it didn't bother Aislinn as much, not here.' (pg20-pg23)

She sees the wolf fey again when she and Seth leave the safety of his steel walls:

'They walked silently for almost a block. Then he asked, "You want to stop at Rianne's?"
"Why?" Aislinn walked a little faster as the wolf-girl who'd given chase earlier started circling predatorily.' (pg36)

Another wolf faery is mentioned in Chapter Six, as Aislinn and Carla walk to school. It is unknown if this faery has been seen before, or has been seen since, in Wicked Lovely:

'Then one of the lupine faeries sniffed her, crystalline fur clattering like tiny glass chimes as he moved, and Aislinn trembled.' (pg65)