Character involved with original story lore stuff. Actually this is a more "humanized" version of her appearance, whereas normally she is a huge tree that looks like the trunk was carved into a feminine figure. I guess this form is like an "avatar" of some sort used to leave where her body is truly rooted, but she has more recently taken a human form.

Said human form is currently ruling over the kingdom her body resides in. Being stuck in one place because of being a godly tree isn't the most ideal of scenarios, especially if said tree is Yggdrasil-like and needs to be protected to keep multiple worlds safe.