He spotted her a lot sooner, because he has Elf vision and then augmented it by making a plastic model in his hand, which he drops on the ground after examining it and concluding that she's not Quendi, not quite. The others in her party are even less Quendi but he makes plastic models of them too, just in case. 

Hello! he calls once she can clearly see him. I'm not reading your mind! I am the kind of telepath who can read minds but I'm not doing it. However it'd be convenient if I were because I don't speak your language, and if you wave at me then I will try to read what you are saying back to me and not read other stuff but I'm pretty bad at that actually.

Well heck. 

"Mages don't do telepathy, do they? Not in real life?"

"Some can. I can't. Morrigan, you can't, can you - "

     "No."

"So we can't. And it's not just sending a message, it's all complicated fade stuff. Why?"

"Telepath at two o'clock."

She waves.

Hi! I don't know if this is working or not! I can't tell very well from here, but you look elven, are you lost?

Hi! We are different kinds of Elves, I am lost and more lost than you're thinking probably!

"Leliana, Draconis. Everybody else just stay on the path, we'll be back with the kid in like two minutes."

Morrigan says something about picking up super-powered urchins being a bad idea as a rule, but hey, that's why she didn't call Morrigan. She's already heading up the mountain to the kid. 

Well, you're found now. Are you Dalish, did you get separated from your clan?

More lost than you're thinking, he repeats impatiently. More lost than you realized people could be, probably. I can teleport if you don't want to hike all the way up here.

That'd be cool, she says, trying not to think that he is adorable, wherever he's from.

Pop! He is very small. He is unreasonably well-dressed. And he has wings, blue leathery bat-wings that are curled tightly against his back so they could have been a backpack from a distance but clearly aren't up close. Hi!

Aww! "Hi!"

She kneels, because it is important to initiate important negotiations with small children from a position of symbolic equality, and this rule probably does not change when the child in question is a ridiculously powerful winged mage wearing clothes that elves really, really don't wear. She offers him her hand. "Aria Tabris."

"Curufinwë Fëanáro."

"Curufinwë Fëanáro," she repeats, hoping she's not butchering that too badly. Doesn't sound elven, but he's obviously a really weird elf, if he is in fact an elf at all. "I assume your parents aren't just hiding behind the mountain or anything."

He's mouthing along as she talks, concentrating.

I ran away from them when I was twelve because I didn't get along with the gods of the planet we lived on and they couldn't leave because my dad's the King. Now Boots and Rúmil are kind of my parents but they're at least two hops from here and I don't know what the intermediate hop is - I was experimenting with a teleporting thing and teleporting can go between worlds that are neighbors but not worlds that aren't and the world I'm from isn't neighbors with this one.

"- I think I am missing a lot stuff I'd need to make sense of that. You are obviously very lost. Can't leave you in the mountains by yourself, though, so if your parents aren't anywhere where we can easily find them, you should probably come with us."

"......that's a demon, Aria."

"So? He's lost."

I don't have his permission to read him so I don't know what he's saying yet.

"He wants to make sure I know you're a demon."

Are there other people here who have this kind of wings? He stretches them out; they're wider than he is tall.

"Just demons. I've only seen wings on desire demons, though, which I'm guessing is not your department."

"I mean, to be clear, if he's going to behave himself I'm not strictly opposed to traveling with a demon that's pretending to be a little kid, but you do realize that they eat mages, right?"

"Draconis, I am aware of what a demon is, I do not kill things that are abiding by the rules of ordinary civilized society."

I still need a translation, he says unhappily, I'm not going to get a language that fast.

"Sorry. He's concerned that you're going to try to possess him."

Oh I can't do that, the kind of demon I am is different.