Knowing more about the Cultivation Realms after the Soul Transformation Realm helped Mira to realize that one's Dao isn't as simple as she thought it was. It seems like the two were more intertwined than she previously thought.
Throughout most of her cultivation journey so far, Mira hasn't spent that much time focusing on her Dao, the Absolute Ice Dao. For one, she just didn't fully understand the importance and intricacies of her Dao.
She knew that if she used her Absolute Ice Dao properly, it could be a very powerful weapon, but just based on her previous experiences, the amount of power she got in exchange for using it was negligible. She felt like her time was better spent elsewhere.
However, now it seems her thoughts have been incorrect. Her Dao is essentially for breaking through some of the later Realms. Who knows, she might need to reach a certain point in her Dao to ascend to the Immortal Realm!