1) Sure, make it a giant ass war. Evyrless wouldn't really care if she's fighting someone else's war, it gives her more xp-- I mean, it gives her more chances to hone her skills.
>.>
<.<
2) I have little knowledge of the feywild (which i should fix, since I'm playing a damned Wood Elf) so I can't really give much input on this. But I think it's a fine idea to use this to anchor Loren into the party. 
3) same as above
4) gosh I'm so useful
5) Please make this the Raven Queen, that would make me so happy. Evyrless would be a sort of foreign emissary, which would be awesome, especially since the death clerics in Ainford would work very differently from any local sorts. (over there it's a combination of overbearing/authoritarian Catholicism and death cult) She'd be very interested in seeing how the locals serve their queen because she doesn't like how her people do it. 
6) They're a ragtag group of misfits like every proper D&D group, what would you expect?

ALSO, ANOTHER INDIVIDUAL QUESTION:
15) "I don't care about most of them." I'd imagine she'd know both the nobles' names because they'd be the most likely to throw them around when first meeting people. The only one here she knows is Harriet, and everyone here has a small lifespan compared to Elves, so she's likely not to care about anyone else present for a while. To be frank, she's kind of using the group as both a means to get close to Harriet again and to make herself more capable. For now, at least. 

Unrelated side-note: I just had the thought that since the Raven Queen, as a mortal, was a sorcerer-queen, a future build I might use for Evyrless should be a Sorceress Drow with divine bloodline (whatever it's called, I think it's in UA and gives Cleric stuffs) that follows after the Raven Queen. Could actually change her build to that now and keep her whole story still >.> 

A weird thought but I'll keep it around since I plan on using Evyrless as a recurring character in my rps. Technically you're seeing a really early version of her right now and I'm still trying to develop who she is and why she does stuff.