It's the footsteps that alert her that she's not alone, and Selina reacts accordingly. Her weight is already balanced on the balls of her feet, and she is all about to stop and find herself a place to stop and watch when she notices the girl.

"Hey." She relaxes slightly, moving towards her by just a step. The girl looked somewhere around her age, and she had a thing for taking kids under her wing when they needed it. "You doin' alright?"