I don't think we ever really worked out anything super solid, just a "yeah they'd probably know one another" kinda thing. But since Jaden and Faer are SUPERCLOSE and Lyn and Faer had a thang that just slammed to an end when her parents took her back from Lanaya's I figured he might, in the very least, know of her if not have met her a few times.
When she left the Dalish, she didn't really get a chance to say goodbye to anyone that wasn't in her clan (Faer included). If they didn't ever meet, she'd at least remember Jaden's name (she's pretty awesome with names despite the fact that I am not >.>) and try and figure out from where she knew him.