[TOMT][Movie] Magical world where a girl tries to defeat her evil sister, who is possessed?

Alright, so I saw this years ago and it's very likely it's not even English made. From what I remember a young woman finds out she comes from a magical kingdom where she is a princess, and so she goes on adventures to free said kingdom and her mother from her evil older sister. Later it turns out the sister is actually possessed by an evil witch/spirit. They discovered some cave together as kids and the main character got scared and ran away, leaving the older sister to be possessed, so it's basically her fault and her mother sent her away after that to save her form the now evil sister.

They had some kind of magical powers. There were goblins. That's all I've got.

Edit: This might be a mini series, I think I remember it having a couple of episodes.

Edit 2: Time frame, right... I'm pretty sure I watched it 5-10 years ago.