I thought mom would either reject Hinako's sexuality as a "mistake" or just be happy that her daughter was happy and I'm honestly really glad that it was both.
Having her mother default to to rejection as a result of internalized homophobia from growing up in a conservative society then truly reflecting on that for probably the first time and having her prejudices eliminated in the face of her love for her daughter is such so nice. It's realistic enough that it feels like this could happen irl which just makes it so much more heartwarming