this is what i think too. the song is heavy and emotional but also lyrical and delicate in places too. this is the music video-
https://youtu.be/V1Pl8CzNzCw
i think she will take some inspiration from this. dark and heavy but icy and cold.
She may also take some inspiration from "13 Reasons Why" (not sure how popular it would be in Russia though), this song was written for the show and I think I would describe it similarly to how you did the music video. I still gets chills every time I hear the song, just from the lyrics and memory of first hearing it a few years ago while watching the show.
I actually think it is a beautiful song with so much emotion built into and I think Alena will be able to feel it so well, this is a great choice for her IMO. I wouldn't focus on it being by Billie, the song should be judged for the way it sounds not by which artist it is from, all of her songs don't fit into just one box. Also one of the Korean juniors used this song last season and I thought it made a nice program for her, can't remember who it was now though, but might be worth a watch.