[Daisy]

Hello. I totally see how a spider fits your backstory. But I did want to point out that the race selected states in the wiki...

"Unlike Muiri, the Aelfeyn's natural form is always humanoid; but many have gained the ability to shapeshift into other natural animal forms, primarily birds and mammals. Native Aelfeyn do not have a dragon shapeshift."

So picking a spider shapechange is a bit out of the norm. May I suggest something smaller like a trapdoor spider?

Also, keep in mind that because of her odd shapechange she is contrary to the norm and that may be an interesting dynamic even among her own kind--she might even be viewed as odd among them.