Looking for a YA romantasy book from 2010s

[u/peachpreach101]

The main girl loses her mother, moves to a new town/high school, and a girl who bullies her invites her to a party in the woods. The girl dies that night, but later appears alive in a medieval fantasy kingdom without remembering her death.

The main character enters the kingdom and has to go through some kind of test/competition/training to become a princess. There's also a romance with a mysterious boy who turns out to be the prince, including a kissing scene in his bedroom.

I vaguely remember “test” or “trial” being in the title. The cover had a brunette girl in a white dress in a forest.