ばか！バカ！　馬鹿ー月！

Greetings, I hope someone can help me. I'm looking for a novel, but I only remember part of the summary. Is about a girl that is the most powerful magician (or something like that) in the world, but one day she meet a person who has better magic than her and can dispel her magic... that is all I can remember.

thanks for ur help. And sorry if I did some mistake.

I think it's Isekai Mahou wa Okureteru!.