This movie is truly beautiful

I love everything about this movie. I wish it got more attention and I wish there were other movies like it. There are some things I wonder though… 1. Was the mom a full Selkie? Or was she part human and just chose the sea? Or was she about to die so she had no other choice? 2. Why didn’t Siersha go with her mom? I feel like she’d be so much happier in the sea… 3. Why was Siersha about to die without her coat or without her singing? Did she just need to “unlock” her full powers?