There is no way to destroy Molly Carpenter, nothing that could rid her of her humanity in short order. Mab still has traces a thousand years after the fact. So unless it can be parsed differently it means kill the Winter Lady. And considering that Mab is planning for her death in battle this is a fraught statement. She effectively says that it may be better to be without a Queen and a Lady.
If you're a Star Trek fanatic you can see some similarities between the episode "Where No Man Has Gone Before" and this.
Outside of the glowing eyes? I really don't, crossing the galactic boundary, both Harry and Molly made that choice, Harry more overtly, Molly, less so, but she continued to train under "Auntie Lea."
Acquire godlike powers, some would say as wizards both had them before the mantles, so far neither is corrupted by them, it is a struggle though and been close. One wants to stop the other because one believes that he or she is a god? Not yet... Struggle with their mantles is the closest to that show.. Oh and did you hear Captain Kirk at age 90 is in space!!!