I’ve been thinking about the reveal regarding the mother placing a seal to suppress her daughter's supernatural powers, along with the hints that the father passed away, and I have a theory on how this all connects.
My theory is that the father died protecting his family. Because of people’s fear of the supernatural, an angry or terrified mob eventually attacked them. The father stepped in to protect his wife and daughter, costing him his life.
Following that tragedy, the mother used her spell to seal away her daughter's powers—not to restrict her, but to shield her. She wanted her daughter to live a normal, peaceful life without ever facing persecution or being targeted for what she is.
This also completely explains why the mother reacted so strongly when her daughter tried to unlock her powers again. To the mother, those powers aren't a gift—they are the exact thing that got her husband killed and the biggest threat to her daughter's safety.