First, I will state that I have no interest in being OP, thus I made her rather weak in combat. So I tried to have every potentially strong ability come with a downside. 

Her special spirit body only amounts to the things I listed, tagged along with a few quirks here and there purely for comedy. But nothing of real use. So no intanginility. Probably really old spirits have that ability, but I made her young to limit that power on purpose. If it isn't obvious, I'm the type of player only driven by narrative and development of characters rather than living a power fantasy or being strong in combat. Most of the time that ends up with dead characters. But oh well. XD

As for why the elders picked her? Well, it was quite literally fortold in the stars. I wanted the spirits to be heavy into mysticisms as they are derived from the living energy of the world, thus heavily connected. I imagined how they would fit in this magical society. A sort of spin on the old concept I suppose. They sent her off to discover exactly how accomplish her life-goal on her own, as is custom, but that doesn't mean she's stupid. Shes not going to be marching up the Nine-Tailed lord challenging him to a one on one death battle. She's going to look for help and get stronger. Since I figured you'd want us all to be together together at some point, I thought it be a great reason for her to go and interact with the other players.

Sorry if the lore is vague. I don't really want to put too much detail into the profile because if I put too much, then what would the point of learning about each others characters through interaction, right? When you could just look at the sheet and learn everything, that kinda ruins the surprise for me. If you want details so you can plot aeound it, I feel it is better to discuss over PMs or something. 

I hope that answered all your questions! :^D