I don't know what happened, I didn't burned her because I put a lock in her while upgrading her NP. And I haven't used one of her ascension materials, and lastly, I haven't upgraded her yet.
I'm frustrated right now.
Evidence that I got her:
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I bought her in the event shop using the special tickets, then recieved them in the gift box immediately. After that, I locked one of it to prevent from accidental burning.